CA1262146A

CA1262146A - Nitrodiaryl sulfoxide derivatives, process for their preparation and pharmaceutical and pesticidal compositions containing them as active ingredient

Info

Publication number: CA1262146A
Application number: CA000475289A
Authority: CA
Inventors: Janos Kreidl; Peter Turcsanyi; Bela Stefko; Jozsef Bakos; Laszlo Szotyori; Balint Heil; Ida Nee Juhasz Deutch; Jeno Szilbereky
Original assignee: Richter Gedeon Vegyeszeti Gyar RT
Current assignee: Richter Gedeon Vegyeszeti Gyar Nyrt
Priority date: 1984-02-29
Filing date: 1985-02-27
Publication date: 1989-10-03
Also published as: JPS615063A; CH665636A5; FR2560191A1; NL8500548A; HU195949B; GB8505138D0; IT1185523B; DE3506954A1; GB2155469B; IT8519662A0; AT395004B; FI850801L; SE8500962L; DK89085A; FI850801A0; GB2155469A; ATA59385A; BE901829A; SE8500962D0; DK89085D0

Abstract

A b s t r a c t The invention relates to new nitroaryl sulfoxide derivatives of the formula (I), (I) wherein R1 is halogen or alkoxy having from 1 to 6 carbon atoms, R2 is hydrogen, halogen, alkyl having from 1 to 6 carbon atoms, alkoxy having from 1 to 6 carbon atoms, or phenyl or phenylthio optionally substituted by one or more identical or different halogen(s) and/or nitro group(s).
The invention further relates to a process for the preparation of these compounds. The new nitroaryl sulfoxide derivatives according to the invention are pharmaceutically active, in particular can be used in the veterinary therapy, preferably as anthelmintics, and show pesticidal activity. Pharmaceutical and pesticidal compositions containing them as active ingredient are also within the scope of the invention.

Description

62~46 NITRODIARYL SUL~'OXIDE DERIVATIVES, PROC~SS ~OR THEIR
PREPARATION AND PHARMACEUTICAL AND PESTICIDAL
COMPOSITIONS CONTAINING THEM AS ACTIVE IMGREDIENT

The invention relatea to new nitrodiar.yl 10 sulfo2ide derivative~, to a procea~ for their prepara- -tion and pharmaceutical and peaticidal composition containing them a~ active ingredient. More particu-lar~y, the invention concerns new nitrodisr.yl aulfoxide derivative~ of tne formula (I) 02N ~ ~ ~ R2 (I) wherein Rl i9 halogen or alXoxy having from 1 to 6 carbon atom~, R2 i9 hydrogen, h~logen, al~yl having from 1 to 6 carbon atom~, alko~y ha~ing from 1 to 6 carbon ~ ~ 2~

atom~ or phe~yl or phe~ylt~io optionalLy sub~tituted b.y one or more identical or different halogen(9) and/or nitro group(s).
According -to another aspect of the invention there i~ provided a process for the preparation of the new compound~ of the formula (I~, wherein Rl and R2 have the same meanings as defined above~ by reducing ~n ar~yl-sulfonyl halide of the formula (II) 02N ~ S02Xl (II) Rl wherein Rl i~ a~ defined above, and Xl is halogen, with an alXali metal sulfite, treating the aryl~ulfinate of the formula ~III) 2N~S 02M
l~ ~ (III) Rl /~' obtained~ in which R i~ as defined above, and M is an ~lkali metal~
with an acid, re~ctin~ the aryl9ulfinic acid of the formul~ (IV) , .

~26~ 6 -- 3 ~

~ ~ ~IV) Rl obtained 9 in which Rl iY as defined above 9 or the ar.Ylsulfinate of formula (III), in ~which Rl and M are as defined ~bove~ with a halogenating agent, and reacting the new ar.yl~ulfi~yl halide of the formula 10 (V) : 02N ~ sox2 ~ (V) : :~ : R
; ~15 obtained, in which Rl i~ a~ defined above and ~2 i9 ~: ~ halogen, with û benzene derivative of the formula (VI), ; 20 ~ (VI~

wherein R i3 as defined in co~nection with the formula (I), in the pre~e~ce of a metal halide cata~yst of the ~ewis acid t,ype~
The ~ew compound3 of the formula (I~ are pharma-~, :
, ~L~6~

ceutical~y active, and can in particular be used in the veterinary therap.y, e.g. a_ nem~tocidesttaenicide3, etc., and preferabLy as anthelmintics, and show pe~qticidal~ e.g. acaricidal, fungicidal, antimicrobial and herbicidal, preferabLy inqecticidal activit.y.
The compounds of the formula ~I~ are further valuable intermediates in the preparation of other new and known, biologicalLy active aromatic ~qulfoxide derivative~, such as benzimidazole ~nd sub~tituted diamino qulfoxide derivatives having anthelmintic and fungicidal activit.y, e.g~ Oxfendazole. The.~ can be prepared from t~he compoundq according to the invention b.y reaction with an amine derivati~e~ ~ub~equent reduction and coupling with a carbamic acid derivative.
CompoundY of the formula (I) ~re new. In the hitherto known nitro-2ub~tituted diar.yl qulfoxides the nitro ~roup wa~ attached to one of the phe~yl ri~gs in ortho- or para-position related to the sulfoxide group~
~nd the other sub~tituents were different from thoYe in the compoundq ~ccordlng to the invention a~ to their qualit~, number and position related to the ~ulfoxide group; while the onLy known compound containing an o-nitro group w~ unsubstituted The structurall.y related, known diaryl sulfo~ides were generalLy prepared by a different procedure, i.e. o~idation of the corre~ponding diaryl ~ulfides ~ Ber. 41~ 2836 ~1908), J. Am. Chem, Soc. 1381 (194~7, , ~fi2 In the for~ulfl ~I) Rl and R2 a~ halogen repre~ent fluorine, chlorine, bromine or iodine, preferabl.y chlorine; while a3 alkoxy having from 1 to 6 carbon atoms the.y 3tand for any straight-chained or branched alko~y group, e.g. metho~y, ethox.y, n-propo~y, i~opropo~y, n-buto~y, sec.~butox.y, i~obuto~y, n-pento~y, i~opentoxy, _-he~yloxy, i~ohe~ylo~y, etc.~ preferably metho~y. In the definition of R2 the term "al~yl having from 1 to 6 carbon atom.a" ia used to refer to straight-chained or branched alk.yl group3, e.g. met~yl, ethyl, n-propyl, isoprop.yl, n-but.yl, ~ec.-butyl, isobut.yl, tert~-but.yl, n-pent.yl, iYopent.yl, n-he~Y19 i~ohe~yl, etc.
In the compounda of' formula (III) M a3 an alkali metal preferably atanda for potaa~ium or ~odium.
In -the compound3 of formulae (II) ard (V) Xl and X aa halogen repreaent fluorine, chlorine, bromine or iodine, preferabLy chlorine.
~ he intermediatea o~ tt~e ~or~ula ~V) are n2w compound~, and their preparation is also within -the qcope of the'pre~ent invention.
The reduction of the ar.ylYulfonyl halides of the formula ~II) with alkali metal sulfites is preferably carried out in an aqueous medium, b.y using the alkali metal sulfite in a 91ight exee99, preferably in an amount o~ 1.1 to 4 moles related to 1 mole of ar.yl3ulfo~yl~halide.
The reduction is performed ~t a tempera-ture of 20 to 35C, iZ~416 preferabLy 22 to 28 C. The reduction ic~ preferabl.y accompli~hed under m:ildly alkaline condition~, between pH 7 and 9, preferabl.y 7.5 and 8.5, for example b.y adding to the reaction mixture an alkali metal bicarbonate, alkali metal carbonate or alkali metal ~ydroxide ~imultaneouql.~. Alternativel.y, the above agentq ma.y be added to the reaction mixture prior to the addition of the reducing agent. The alkali metal component~ of the above reactants are preferabLy identical with the alkali metal of the alkali metal ~ulfite uc~ed a~ a reducing ~gent, The above alkaline agent~ C~erve alqo for acid binding. The slkali metal bicarbonatec~, carbonateq or hydroxic3e9 can be uqed either in a qolid form or in the form of their ~aturated aqueous solutionq or qir.~ultaneously in both formq.
The acid treatment of the compoundc~ of t~e formula (II~) iq preferabLy carried out with ~ ~trong mineral acid, preferabLy concentrated aqueous ~ydrochloric acid, ~ulfuric acid, etc. The mineral ~cid i9 preferab~y used in an exces~ amount. The aryl~ulfinic acid obt~ined after ~ydrolysis 19 very pure (has a purit.y of ~t least 98 %3 and stable, ln contrary to the ~rylsulfinic acids prepared earlier by different proceC~ses. Compounds of for~ulfl (IV) are obtained in a very high .yield, which con9iderabLy exceed9 the yield of the hitherto known processes L Houben~Weyl, ~, 317.

Both t~e ~r.yl~ulfinates of for~ulq ~III) and -the arylaulfinic acid~ of formula (IV) can be reacted with a halogenating agent, to .yie~d the correaponding aryl~ulfi~yl halide of the formula (V). As a halogenating agent an inorganic ox organic halogenating agent can be u~aed. Inorganic halogenating agents include for example the compoundq o~ qulfur and pho~phorus wi-th halogen or with halogen and o~y~en. T.ypical representatives of these compounds are thionyl chloride, pho~phoruY tri chloride, phoagene, phoaphorus pentachloride, pho~phorua o~ychloridet and a combination of phosphorus o~ychloride and chlorine. Organic halogenating agenta include orgflnic acid halides, ~uch as oxal.yl chloride. The ar.yl~ulfi~yl halide~ of the formula ~V) are new compounds, which are con~iderab~y more ~table -than the differentLy substituted ar.yl~ulfinyl halidea known in the art.
~ ing the reaction of the compounda of formula (V~
with the compound~ of formula (VI) as a metal h~lide cataLy~t of the Lewi~ acid type a~y cataLyst conventionall.y u9ed in Friedel-Crafts acylation9, e.g. preferably aluminium trichloride, can be used. According to a preferred embodiment of the reaction compounds of the formula (V) are reacted with the compound~ of the formula ~VI) without iYolation, directl.y after elimination of the halogenating agent. The metal halide catalyst of the Lewis acid t.ype i9 preferabLy u~ed in an amount ~ ,2~E;2~ 6 of 1~1 to 1.8 moles related to 1 mole of the ar~l~ulfi~yl halide o~ ~ormula (V). The reac-tion i~ performed between 0 C and 80 C, preferabLy 25 C and 42 C.
The proces~ according to the invention yield~
the new nitrodiaryl sul~o~ides in a high purit.y (at least 98 %) with excellent .yield (90 to 96 % related to the correqponding ar~lsul~inic acid, and sbout 85 %
related -to the corresponding ar.ylsul~o~yl halide). The process according to the invention ca~ ea~ily be carried out even on industrial scale The reaction mixtures can be proce~sed b.y conventional techniques, for e~ample extraction9 filtra-tion, evaporation, precipitation with ~ater, elimination of the solvent or the excess of reactants, decantation, etc.
The compound~ o~ the formula (I) can be ~ubjected, if desired, to further purification, e.g. recr.ystallization.
The solvent~ used for recr.ystallization are selected depending on the solubilit.y ~nd cry~talli~stion properties of the compound to be c ~ stallized.
The active compounds of the ~ormula (I) mfl.y be formulated for therapeutic purpose~. The i~vention therefore relate~also to pharmaceutical compositions comprising a~ active ingredient at least o~e compound of form~lla (I), in as90ciation with pharmaceutical carriers and/or exciPients, Carriers conventional for this purrose and 9uitable for parenteral or enteral admi~i9tration ~ Z6 ~ 6 aq well as other additives may be used. As carriers solid or liquid compounds, for example water, gelatine, lactose, starch, pectin, magneslum stearate, stearic acid, talc, vegetable oils, such ag peanut oil~ olive oil, etc, can be used. The compounds can be formulated as conventional pharmaceutical formulations, for example in a solid ~globular and angular pills, dragées, e.g. hard gelatine capsules) or liquid (injectable oiLy or aqueous 901u-tions or cucpensions) form. The quantit.y of the solid carrier can be v3ried within wide ranges~ but preferabLy it is between ~5 mg. and 1 g. The compositions optionall.y contain also conventional p~arrnaceutical ~dditives, ~uch as preserving agents, wetting agents, qalts for adjusting the o~motic pressure, buffers, flavouring and odouring substances.
The compositions according to the invention optionall.y contain the compound~ of formul~ (I) in a~qociation with other known acti~e ingredients. T~e unit do~e~ are selected dependin~ on the route o*
admini~tr~tion. The pharmaceutical compositions are prepared by conven-tional techniques includin~ sieving, mi~ing, granulation, pressing or dissolution of the active ingredients. The formulations obtained are then subJected to additional conventional treatments, such a~ qterilization.
~or u~e as pesticides~ the compound2 of the ;2~

formula (IJ flre f`ormulated a~ conventional ~ormulation~, e.g. qolutions, e~ulsion~, soluble powders, suspension~ 9 powder compositions, aerosol compositiona, qu~penaion and emulsion concentrate~ 9 powders for aeed dre~ing.
The compounds can be u~ed for impre~nating natural and synthetic materials, may be formulated as microcapaulea, using poLymeric ~ubstances and materials ~uitable for coating ~eed~, or can be converted into ~ormulation~
~upplied with burnable Iilling, auch as amoke patron~
boxe~, spiral~, and warm or cold fog compositionai which ma.y be applied by ULV (ultra-low-volume) technique.
The pecticidal compo~itiona can be prepared in a manner known per ae, ~or example by admixing the active ingredientq ~rith carriera, i.e. liquid aolventa, liquified gaaes under preaaure and/or solid carriers.
If de ired, alao aurfactanta 9 emulcif.~ing and/or diapercing and/or ~oaming agents can be added to -the a.ystem. If water is u~ed as a carrier, a~a a co-~aol~ent or~anic aolventa ma.y alYo be emplo.yed. The liquid ~olvents essentiall.y include aroma~ic compound~ such a~ x.ylene, toluene or alkylnaphthalenea; chlorinated aromatic or chlorinated aliphatic hydrocarbon~ ~uch as chlorobenzene, chloro-ethylene or methylene chloride; aliphatic hydrocarbons, ~uch as c.yclohexane or paraffines ~uch as mineral oil fractions, aa well as alcohola ~uch a9 butanol or gLycol and the ether~ and ester9 thereo~; ketones 9uch as acetone, methyl et~yl ketone, methyl i~obut.yl ketone or c.yclohexanone; strong~y polar ~olven-ts ~uch a~
dimet~yl ~ormamide, dimethyl qulfoxide and water. Under liquidified ga~eou9 carriers for example aerosol propellant~ ~uch as halogenated hYdrocarbon~, butane, propane, nitrogen and carbon dioxide are mean-t. As solid carriers for example natural fo~ail meala, e.g. caoline, clay esrth, t~lc, chalkctone, quartz1 attapulgite1 montmorillonite or diatomaceous earth, and ~.ynthetic foq~qil meals quch as highLy di~per~ed ~ilicic acid, alu~ina and silicatea are emplo.yed~ As carriers for granulates for example broken and fractionated natural rock3, e.g. calcite, marbel, pumice, ~epiolite, dolomite, and granulate~ of inorganic and organic mealq, a~ well as granulates prepared from orgsnic material~ ~uch as sawdust~ coconut~ ~helll corn hu~k and tobacco stem~
can be u~ed. As emul~if.ying agents and/or foami.ng agent~
non-ioni.c and anionic amulsifier~ ~uch aq pol.yoxyeth.ylene fatty acid ether~, polyo~yet~ylene fatt.y ~lcohol ether~, e.g. al~ylar.ylpolyg~ycol ether, alkylsulfonates, alkyl-aulfates, ar.yl~ulfonate~ and protein hydrol.y~a-te~, while as diqpersing agents e.g. lignine, ~ulfite waste liquors and methyl cellulose ma.y be emplo.yed~
The pe~ticidal composition~C according to the invention ma.y contain al~o adhesives ~uch a~ carbox.y-meth~yl cellulose, natural and qynthetic, powder.~, ~L:2Ç;21.~4~
,, granular or latex-like pol.ymers, e~g. acacia gum, pol.yvi~yl slcohol, poLyvinYl acetate, etc The peqticidal compoqitions according to the invention ma.y ~urther contain various pigment~ quch aq inorganic pigment~, e.g. iron oxide, titanium dioxide, ferroc.yane blue and organic pigmentq, e.g. alizarine, azometal phthaloc.yanine pigment~, as well a~ micro-nutrients, e.g. iron, mangane~e, boron, copper, cobalt9 moLybdenum and zinc salts.
The pe~ticidal compo~ition~ generalLy contain 0.1 to 95 ~ b.y weight, preferably 0.5 to 90 % by weig~t of active ingredient.
The active ingredients ma.~ be applled in the form of commercial formulation3 and/or read.y-to-use formulation~
prepared therefrom~
The active ingredient concentration of the ready-to-use formulation~ prepared from the co~ercisl pe~ticidal compositions ma.y var.y ~Iqithin ~de limit~, and generalLy iq between 0.000 000 1 and 95 ~ b.y weight, preferabLy 0.01 and 10 % by .weight, ~ he route o~ application alwa.ys depends on the specific formulation uqed.
The invention is elucidated in det~il b.y the aid of the ~ollowing non-limiting Examples.

: :

~ 2 Ex~mple 1 Sodium 4-chloro-3-nitro-benzeneculfinate To a ~olu-tion of 24 g. of ~odium bicarbonate in 30 ml. of water 71.8 g. (0.57 moles) of qolid 9 anhydrou~
~odium sulfite are added~ To the homogenous solution a mi~ture of 58.4 g. (0.228 moles) of 4-chloro-3-nitro-benzenesulfo~yl chloride and 2~ g. of sodium bicarbon~te i~ uniformly sdded in 2 hours, at 23 to 25 C. When the addition i~ complete, the su~pen~ion i~ ~tirred at 23 to 25 C for 4 hours and sub~equently, after addition o~ 20Q ml. of toluene, at 35 C for 15 minutes. It i~
then cooled to 23 to 25 C ~nd ~tirred. T~e product iq filtered off and air dried.
56 g. of ~odium 4-chloro-3-nitro-benzenesulfinate are obtained. Accordin~ to the pota~ium permangan~te analytical method the product contains 85 ~0 of active sub~tance and 15 % of water.
Yield: 90 % o~ theoretical 4-Chloro-3-nitro-benzene~ulfinic acid The sodium ~alt prep~red according to Example 1 i~ dis~olved in 300 ml, of water at 40 C and filtered at the ~ame temperature. The filtrate i~ cooled to 10 to 15 C, acidified with 100 'nl. of concentr~ted aqueou~ hydrochloric acid 901ution under thorou~h stirring~ cooled to 5 C, filtered and the product ~ 6 obtained i~ dried at a temperature not exceedlng 4o C
43 g. of white, cr.y2talline 4-chloro-3-nitro-benzenesulfinic acid are obtained.
Purit.y: 99 ~0 ~elting point: lO to 103 C.
Yield related to the ~ulfonyl chloride: 85 % of theoretical Example 3 Phe~yl-(4-chloro-3-nitrophenyl) ~ulfoxide a) 36 g. (0.1625 moles) of 4-chloro-3-nitro-benzene2ulfinic acid prepared accordi.ng to Example 2, 75 ml. of benzene and 15.1 ml. of t~ionyl chloride are ad~ixed. T'ne reaction mixture ic boiled for one hour and di2tilled in vacuo at a temperature below 60 C.
To the re2idue two further 25-ml-portion2 of benzene are added and the ~olvent i eli~in~ted e~ch time. To the re~idue weighing about 40 g. ~n24 = 1.6240), which i~
crude 4-chloro-3-nitro-benzene~ulfin.~l chloride, 20 ml.
of dichloroethane are added, ~ollowed b.y t~e addition of 28.2 g. (0.21 mole~) aluminium chloride under cooling, at a temperature below 40 C. Thereafter 35 ml. of benzene are added to the mixture at 40 C within half an hour~
The reaction mixture is 2tirred at 4~ C for two hour9, diluted with 50 ml. of benzene, poured onto a mixture of lO0 g. of ice and 50 ml. of water, the org~nic phase i9 extracted with 50 ml. of benzene. The combined ben~ene phaseq are decoloured wit~ 5 g. of charcoal~ filtered ancl the ~olvent i~7 elirninated from the filtra te in vacuo .
45 g. of white pher~yl-( 4-c~loro-3-nitro-pher~yl) qulfoxide are obtained.
5 Melting point: 86 to 87 C
Purity: 9~ -~ (according to high-presqure liquid chromato-graphy ) Yield: 96 ~ of theoretical b) There are admixed 36 ~;. (0.1625 moleq) of 4~
10 chloro-3-nitro-benzene~ulfinic acid prepared accordin~3 to Example 2, 20 ml. of dichloroethane~ 13.5 ml. (22 g., 0~185 mole~) of thiorLyl chloride and 0.1 ~l. of tri-et'n.yl amine. The qulfinic acid iq gradualLy diYsolved ;~rhile gas evolution i~ obc~erved. The reaction. mixture i9 15 he3ted at 50 C for one hour, cooled to 5 to lO C, and 28.2 g. (0.21 mole~ of alurr~iniurn chlo-ide ~re added to the Yolution, taking care that the temperature of`
the reaction mixture ~hould not exceed 40 C. Thereafter 35 ml. of benzene are added to the mixture at 40 C, 20 in half an hour. The reaction mixture i~ ~tirred at 40 C
for two hour~, diluted with 50 ml. of benzene, end poured onto a mixture of lO0 g. of ice and 50 mlO OI
weter. The organic pha~e i9 separated, and the aqueou~
pha~e i~ extracted sNith 50 ml. of benzene. The combined 25 benzene pha~e~ are decoloured with 5 g. of activated carboIl, filtered and from the filtrate he overwhelming _ 16 -part of benzene is eliminated b.y distillation in vacuo, when a solid qub~tance is precipitated. Therea~ter, the remaining psrt of benzene i~ eliminated with methanol, under atmo~pheric pre~sure, 90 that the reaction mixture ~hould contain about 60 to 70 ml. of methanol. The ~olution i~ then allowed to cool alowl.y. At 40 to 50 C
cr.ystallization qtarts. When the product form~ a thick cr~3tal pulp, 100 ml. of water having a temperature of 40 to 50 C are added to the reaction mixture at 40 to 50 C, initiall.y at a low rate. The loo~e, finel.y diaper~ed auapenqion i9 cooled to 15 to 20 C under ~igoroua stirrin~ filtere~ and dried.
45 g. of the deaired compound are obtained. The p~ysical properties of the product are identical with 15~ those of the product prepared according to variant aJ.
Examp_e 4 Phe~yl-(4-chloro-3-nitrophe~yl) aulfo~ide ; 23 g. (0.08 moles) o~ 84.7 % ~odium 4-chloro-3-nitro-benzene~ulfinate prepared according to 3xample 1 are diasolved in 50 ml. of benzene~ To the solution 9.2 ml. (0~112 molea) o~ phosphorus trichloride and 10 ml.
o~ benzene are added at a temperature below 30 C, under vigorous stirring, in about 1.5 hours. The mixture is stirred for turther 2.5 hour9 at 22 to 25 C, the benzene ~olution of the sulfi~yl chloride deriva-tiYe ~, i9 decanted or filtered off b.y suction~ ~rom the solution ~ I

~262 obtained the ~olvent i~ eliminated in vacuo and distillation i9 repeated wit~ two 20-ml portions of benzene. The pale-yellow oil.y ~ul$i~yl chloride derivative (nD4 - 1.6250~ iq diluted with 18 ml. of benzene, and is then added to the ~u~pen~ion of 11.34 g. (0O085 moles) of aluminium chloride in 18 ml~ of benzene at a temperature below 15 C. When the addition is complete, the reaction mixture i~ allowed to warm up to 40 C, and it i~ stirred at this temperature for two hours.
The reaction mi~ture is then poured on-to 100 ml. of ic.y water. The ~eparated aqueous phase is extracted with 25 ml. of benzene. The combined benzene phase~ are decoloured with activated carbon, filtered and the ~iltrate is evaporated in ~acuo.
21 g, of the deaired compound are obtained.
Melting point: 86 to 87 C
Yield: 95 % of theoretical Example ~
(4-Chloro-3-nitrophenyl)-4-methylphe~yl ~ulfoxide To about 4~ g. of benzene- and thienyl chloride-free 4-chloro-3-nitrobenzene sulfinyl chloride prepared according to Example 3 100 ml. of toluene ~nd subsequently 28,2 g, (0~21 moles) of aluminium chloride are added at 20 Cs under cooling. The reaction mixture is stirred at 35 C for 2.5 hours, and is further treated a9 described in Example 3.

~2~ a6 42 g. of the desired compound are obtained.
Melting point: 82 to 84 C
Yield: 87 rO of theoretical Exflmple 6 (4-Chloro-3-nitrophe~yl)-4-chlorophenyl sulfoxide T~e procedure described in Example 5 is followed, except that instesd of toluene chlorobenzene is used, and the reaction mixture is stixred at 50 C for 4 hours.
The title compound iq obtained with ~ .yield of 89 ~.
~elting point: 110 to 112 C.

Phe~yl-(4-metho~y-3-nitrophen~ylJ ~ulfoxide 4-Metho~y-~-nitrobenzene qul~onyl chloride ~meltin~ point: 66 C) is reduced with sodium ~ulfite as described in Example 1, and the ~odium 4-methox~-3-nitro-benzene ~ulfinate is further trea-ted as described in ~ample 4.
The tiile compound i9 obtained with a ~ield o~
88 ~. Melting point: 135 to 137 C.
~xamPle 8

2-Chloro-5-nitrobenzene sul~'inic acid 321 ml. (4.7 moles) of chlorosul~onic acid and 79 ~. (0.5 moles) of 4-chloro-nitrobenzene are stirred at 130 C for 6 hour9~ The reaction mixture is then cooled to a temperature below 10 C ~nd is poured onto 750 ml. of i~.y water. The mixture is filtered at room ~ ~ 2 temperature ancl t~e sub~tance collected on the filter i9 washed acid-Yree with about 2 litre~ of water. The crude 2-chloro-5-nitrobenzene ~ulfo~yl chlorlde obtained i9 su~jected to the subsequent reaction ateps without purification. 118 g. (0.~35 mole~) of anh~drous qodium sulfite and 20 g, of qodium bicarbonate are di~solved in 250 ml. of water, and to the solution obtained a mixture of the crude 2-chloro-5-nitrobenæene culfo~yl chloride and 20 g. of ~odium bicarbonate is added at a temperature of 23 to 25 C, in one hour. The reaction n~xture i9 3tirred for t~o hours at a temperature of 23 to 25 C, and, after the addition of 200 ml~ of toluene, for further 15 minutes. The mi~ture iq stirred at 25 C and the cubctance filtered o~f ic wa~hed with 100 ml. of toluene. The ~odium 2-chloro-5-nitrobenzene qulfinate obtained i9 discolved in 400 ml. of water at 40 C, and the colution iq admixed with 200 ~1. of toluene. The insoluble part i9 -~`iltered off and the toluene pha~e is ~eparated from the filtrate. Ihe ~queous phase is cooled to 10 C, acidified with 100 ml.
of concentrated aqueous hydrochloric acid solution and the precipitated cr.y~tals are ~tirred, filtered off at C and dried. 61 g. of 2-chloro-5-nitrobenzene sul~inic acid are obtained, Yield: 55 ~ of theoretical related to 4-chloro-nitrobenzene.
Melting point: 128 to 130 C

~ 2 _ 20 -Purit,y: 98 ,~ (according to potasqium permanganate anal.ytical method) Example 9 Phe~yl-(2-chloro-5-nitrophe~yl) ~ulfoxide 26 ~. (0,1625 mole~) oY 2-chloro-5-nitrobenzene sulfinic acid a~e admixed with 60 ml~ of benzene and 36 ml. of thion,yl chloride. The reaction ~ixture is boiled for one hour. ~urtheron the procedure de~cribed in Example 3 is follo~Yed, except that instead o~` benzene dichloroethane is uqed for dilution and extraction.
40 g. o~ phenyl-(2-chloro-5-nitrophenyl) sulfoxide are obtained as a white microcr.ystalline ~ubstance.
Melting point: 150 to 152 ~
Purit,y: 97 % (according to high-preq3ure liquid chromato-graphy) Yield: 85 % of theoretical Example 10 4-(4-Chloro-3-nitrobenzene~ulfi~yl)-biphenyl The procedure deqc~ibed in Example 5 is ~ollowed except that inqtead of toluene biphe~yl is employed. ~he desired compound i,~ obtained with a .yield of 90 %, Melting point: 98 ~to 99 C.
~xample 11 4-(4-Chloro-3-nitrophenylthio~-phenyl-(4-chloro-3-nitro-phe~yl) sulfoxide ' 36 ~. (0~1625 ~ole~) of 4-chloro-3-nitrobenzene ~ 2 sulfinic acid prepared accordi~ to Example 2, 35 ml, o~
ben2ene, 10.5 ~1, (0~143 mole~) of thio~yl chloride and 0.1 g. of anhydrou~ ferric chloride are boiled for one hour. q`o t~e ~olution 28.2 g. (0.21 moles) of aluminiumchloride are added at a temperature below 40 C.
The reaction mixture is ~tirred ~t 40 C for 2 hours, whereupon the procedure de~cribed in Example 3 i~ followed.
The oiLy product obtained i~ di~olved in hot ~ce-tone, to the solution a ~mall amount of aqueous methanol i9 added, whereupon the separated oil is dis~olved in hot acetone and treated again with aqueous meth~nol. The oil.y portion i9 qeparated, ~pon addition of acetone the desired compound i~ obtained in a crystalline formO
11.4 g~ of the title compound are obtained, ~5 Yield: 30 ~0 of theoretical Melting point: 144 to 146 ~C
Example 12 (4-Chloro-3-nitrophe~yl)-4 methox~phe~yl ~ulfoxide The reaction mixture containing 4-chloro-3 nitrobenæene ~ulfi~yl chloride prepared as described in Ex~mple 3, variant bJ is released from thionyl chloride b.y distill~tion in vacuo, To the residue 50 ml, o~ dichloroethane and 21,6 g. of anisole are added, the mixture i9 cooled to -5 C and 33.4 g~ of aluminium chloride are portionwlse added, taking care that the temperat~re of the mixture should not e~ceed 20 C. The reaction mi~ture i9 then kept at 20 C for 4 hours? poured ~L2~Z~6 onto 300 ml~ o~ ic.y water, extracted with dichloro-ethane and the solvent i2 eliminated ~`rom the organic ~olvent pha~e in vacuo.
46.5 g. o~ (4-chloro-3 nitrophenyl) 4-methox,y-phenyl qul~oxide are obtained.
Yield: 92 ~ o~ theoretical Melting point: 1~4 to 126 C
~L~
(4-Chloro-3-nitrophenyl)-4-fluorophen,yl ~ulfoxide To about 40 g. of crude, benzene- and thionyl chlorid~-Yree 4-chloro-3-nitrobenzene ~ul~inyl chloride prepared according to a~y v~riant o~ Example 3 90 ml. of luorobenzene are added~ followed by the addition of ~3.6 g. o~ alumirium chloride under cooling. The reaction mixture l~ then 9 tirred st 55 C for 5 hours and i9 further Ireated a9 deqcribed in ~xample 3, except that the reaction mixture i~ not diluted with benzene.
42 g. of the de~ired compound are obtained~
Yield: 86 ,~o of theoretical Meltin~ point: 84 to 85 C
Example 14 ?( 4-Bromophenyl)-(4-chloro-4-nitrophenylJ ~ulfoxide To about 40 g. of crude 4-chloro-3-nitrobenzene ~ulfinyl c~loride prepared according to any variant of 25 Example 3 100 ml. o~ bromobenzene are ~dded, Under cooling 33~6 g~ of alumi~m chloride are added to the .

~ Z6 2~6 mixture~ which iY -then stirred at 50 C for 3 hours and i~ ~urther treated a~ de~cribed in ~xample 3, except that benzene i9 added to the reaction mixture after pouring onto water, and the e~ce~s of bromobenzene i9 eliminated from the reaction mixture by distillation at 6G to 70 C, under a pressure of 30 to 40 mmHg.
54.5 g~ o~ the deaired compound are obtained.
Yield: ~3 % of theoretical Melting point: 138 to 140 C
10 ~
4-Chlorophenyl~ chloro~5-nitrophenyl) aulfoxide 36 g. (0.1625 moles) of 2-chloro-5-nitrobenzene sulfinic acid prepflred according to ~xample 8 are converted into 2-chloro-5-nitrobenzene ~ulfinyl chloride as described in Example 3. It i9 then releaaed from benzene and thionyl chloride, diluted with 100 ml. o~ chloro-benzene, and to the mixtuxe 28 2 g. o~ alumimlm chloride are added under ~tirring. The reaction mixture i9 then ~tirred at 55 C for 5 hour~ and i~ further t~eqted ~g described i~ Example 3, exeept that the dilution with benzene i9 carried out on~y after pouring onto waterO
44 g. of the de3ired compound are obtained.
~ield: 86 % of theoretical Melting point: 142 to 144 C

_ 24 -(4-E-tho~y-3-nitrophe~yl~-phe~yl ~ulfoxide The procedure de~cribed in Ex~mple 7 i9 followed, except that 4-etho~y-3-nitrobenzene ~ulfo~yl chloride iq u~ed as a qtarting material and from this sodium 4-etho~y-3-nitro`oenzene ~ulfinate i9 prepared a~ deqcribed in Example 1, with a yield of 70 ~,~ which ~9 then treated further a3 deqcribed in Example 4, The desired compound i9 obtained with a .yield of 86 %.
Melting ~oint: 119 to 121 C.
~:Z
1-(4-~romophe~yl)-4-(4-chloro-3-nitrophe~ylqulfinyl)-benzene The procedure described i~ Example 5 is followed, except that in~tead of toluene 4-bromo-biphe~yl i~ used.
The de~ired compound i9 obtained with a yield of 80 %.
Melting poi~t: 1~3 to 175 C.

(4-Chloro-3-nitrophe~yl)-4-methylthiophenyl ~ulfoxide The procedure described in E~ample 5 is followed~
e~cept that instead o~ toluene thioanisole is used.

1-(4-Nitrophe~yl) 4 (4-chloro-3-nitrophe~ylsulfi~yl) benzene The procedure described in Example 5 i9 followed~

~,2~ 6 except th~t toluene is replaced by 4-nitro-bipherLyl.
~he title compound i~ obtai.~ed wi-th a .yield of 50 %.
Melting point: 220 to 222 C.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A process for preparing a nitrodiaryl sulfoxide of the formula (I) (I) wherein R1 denotes halogen or alkoxy having from 1 to 6 carbon atoms, and R2 denotes hydrogen, halogen, alkyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, phenyl, phenylthio or alkyl having 1 to 6 carbon atoms, alkoxy having from 1 to 6 carbon atoms, phenyl or phenylthio each substituted by halogen or nitro, which process comprises reacting an arylsulfinyl halide of formula (V) (V) wherein R1 is as defined above and X denotes halogen, with a benzene derivative of the formula (VI) (VI) wherein R2 is as defined above.

2. A process according to claim 1 wherein the compound of formula (V) as defined in claim 1 is obtained by reacting a comp-ound of formula (IV) (IV) Wherein R1 is as defined in claim 1, or a compound of formula (III) (III) wherein R1 is as defined in claim 1 and M is an alkali metal, with a halogenating agent.

3. A process according to claim 2 wherein (a) the compound of formula (IV) as defined in claim 2 or (b) the compound of formula (III) as defined in claim 2 are obtained, in the case of (a), by reducing a compound of formula (II) (II) wherein R1 is as defined in claim 2 and X1 denotes halogen with an alkali metal sulfite, and, in the case of (b), by reacting a compound of formula (III) as defined in claim 2 with an acid.

4. A process according to claim 3 wherein the molar ratio of alkali metal sulfite to the compound of formula (II) as defined in claim 3 is 1.1 to 4 moles of alkali metal sulfite to 1 mole of the compound of formula 2.

5. A process according to claim 3 wherein the reaction is carried out between 20°C and 50°C.

6. A process according to claim 3, 4 or 5 wherein the react-ion is carried out in a slightly alkaline medium.

7. A process according to claim 3 wherein the compound of formula (III) as defined in claim 3 is reacted with an excess of strong mineral acid.

8. A process according to claim 1 wherein the compound of formula (V) as defined in claim 1 is obtained by reacting a com-pound of formula (IV) (IV) wherein R1 is as defined in claim 1, or a compound of formula (III) (III) wherein R1 is as defined in claim 1 and M is an alkali metal with a halogenating agent and the compound of formula (V) thus obtained is reacted with the compound of formula (VI), after elimination of excess halogenating agent, without isolation.

9. A process according to claim 1 or 8 wherein the reaction is carried out in the presence of 1.1 to 1.8 moles of aluminum chloride per mole of arylsulfinyl halide of the formula (V) as defined in claim 1 or 8.

10. A process according to claim 1 or 8 wherein the reaction is carried out at between 0°C and 80°C.

11. A nitrodiaryl sulfoxide of the formula (I), (I) wherein R1 is halogen or alkoxy having from 1 to 6 carbon atoms, R2 is hydrogen, halogen, alkyl having from 1 to 6 carbon atoms, alkoxy having from 1 to 6 carbon atoms, phenyl, phenylthio or alkyl having from 1 to 6 carbon atoms, alkoxy having from 1 to 6 carbon atoms, phenyl or phenylthio each substituted by halogen or nitro.

12. A compound according to claim 11 wherein R1 represents chlorine methoxy or ethoxy and R2 represents hydrogen, fluorine, chlorine, bromine, methyl methoxy, phenyl, methylthio, bromophenyl, nitrophenyl or chloronitrophenylthio.

13. Phenyl-(4-chloro-3-nitrophenyl) sulfoxide.

14. (4-Chloro-3-nitrophenyl)-4-methylphenyl sulfoxide.

15. (4-Chloro-3-nitrophenyl)-4-chlorophenyl sulfoxide.

16. Phenyl-(4-methoxy-3-nitrophenyl) sulfoxide.

17. Phenyl-(2-chloro-5-nitrophenyl) sulfoxide.

18. (4-Chloro-3-nitrophenyl)-4-biphenylyl sulfoxide.

19. 4[(4-Chloro-3-nitrophenylthio)-phenyl]-(4-chloro-3-nitrophenyl) sulfoxide.

20. (4-Chloro-3-nitrophenyl)-4-methoxyphenyl sulfoxide.

21. (4-Chloro-3-nitrophenyl)-4-fluorophenyl sulfoxide.

22. 4-Bromophenyl-(4-chloro-3-nitrophenyl) sulfoxide.

23. 4-Chlorophenyl-(2-ch1oro-5-nitrophenyl) sulfoxide.

24. (4-Ethoxy-3-nitrophenyl)-phenyl sulfoxide.

25. 1-(4-Bromophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.

26. 1-(4-Nitrophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.

27. Pharmaceutical composition comprising at least one compound according to claim 11, as active ingredient, in association with a pharmaceutical carrier or excipient.

28. A pharmaceutical composition according to claim 27 wherein the active ingredient is a compound according to claim 12,

29. A process for preparing a pharmaceutical composition, which comprises admixing a nitrodiaryl sulfoxide of the formula (I) as defined in claim 11, as active ingredient with at least one pharmaceutical carrier or excipient.

30. A pesticidal composition comprising a pesticidally effective amount of a compound according to claim 11 as an active ingredient in admixture with a diluent or carrier.

31. A pesticidal composition according to claim 30 wherein the active ingredient comprises 0.1 to 95% by weight of the composition.

32. A pesticidal composition according to claim 30 or claim 31 wherein the active ingredient is a compound according to claim 12.

33. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises phenyl-(4-chloro-3-nitrophenyl) sulfoxide.

34. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-methylphenyl sulfoxide.

35. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-chlorophenyl sulfoxide.

36. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises phenyl-(4-methoxy-3-nitrophenyl) sulfoxide.

37. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises phenyl-(2-chloro-5-nitrophenyl) sulfoxide.

38. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-biphenylyl sulfoxide.

39. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises 4[(4-chloro-3-nitrophenylthio)-phenyl]-(4-chloro-3-nitrophenyl) sulfoxide.

40. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-methoxyphenyl sulfoxide.

41. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-fluorophenyl sulfoxide.

42. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises 4-bromophenyl-(4-chloro-3-nitrophenyl) sulfoxide.

43. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises 4-chlorophenyl-(2-chloro-5-nitrophenyl) sulfoxide.

44. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises (4-ethoxy-3-nitrophenyl)-phenyl sulfoxide.

45. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises 1-(4-bromophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.

46. A pharmaceutical composition according to claim 27 wherein the active ingredient comprises 1-(4-nitrophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.

47. A pesticidal composition according to claim 30 wherein the active ingredient comprises phenyl-(4-chloro-3-nitrophenyl) sulfoxide.

48. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-methylphenyl sulfoxide.

49. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-chlorophenyl sulfoxide.

50. A pesticidal composition according to claim 30 wherein the active ingredient comprises phenyl-(4-methoxy-3-nitrophenyl) sulfoxide.

51. A pesticidal composition according to claim 30 wherein the active ingredient comprises phenyl-(2-chloro-5-nitrophenyl) sulfoxide.

52. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-biphenylyl sulfoxide.

53. A pesticidal composition according to claim 30 wherein the active ingredient comprises 4-(4-chloro-3-nitrophenylthio)-phenyl]-(4-chloro-3-nitrophenyl) sulfoxide.

54. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-methoxyphenyl sulfoxide.

55. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-chloro-3-nitrophenyl)-4-fluorophenyl sulfoxide.

56. A pesticidal composition according to claim 30 wherein the active ingredient comprises 4-bromophenyl-(4-chloro-3-nitrophenyl) sulfoxide.

57. A pesticidal composition according to claim 30 wherein the active ingredient comprises 4-chlorophenyl-(2-chloro-5-nitrophenyl) sulfoxide.

58. A pesticidal composition according to claim 30 wherein the active ingredient comprises (4-ethoxy-3-nitrophenyl)-phenyl sulfoxide.

59. A pesticidal composition according to claim 30 wherein the active ingredient comprises 1-(4-bromophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.

60. A pesticidal composition according to claim 30 wherein the active ingredient comprises 1-(4-nitrophenyl)-4-(4-chloro-3-nitrophenylsulfinyl) benzene.