US3808260A - Process for producing alkyl chrysanthemates - Google Patents
Process for producing alkyl chrysanthemates Download PDFInfo
- Publication number
- US3808260A US3808260A US00251199A US25119972A US3808260A US 3808260 A US3808260 A US 3808260A US 00251199 A US00251199 A US 00251199A US 25119972 A US25119972 A US 25119972A US 3808260 A US3808260 A US 3808260A
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- US
- United States
- Prior art keywords
- hexadiene
- dimethyl
- alkyl
- diazoacetate
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
- C07C69/743—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring of acids with a three-membered ring and with unsaturation outside the ring
- C07C69/747—Chrysanthemumic acid esters
Definitions
- PROCESS FOR PRODUCING ALKiL cxmsmmmms Filed May 8 1972 2 Sheets-Sheet a Low boiling point compounds Diazoacetate and 2,5- dimethyl 2,4-hexadiene United States Patent 3,808,260 PROCESS FOR PRODUCING ALKYL CHRYSANTHEMATES Chiseki Yoshikawa, Oita, Harold Takeda, Osaka, and Masaaki Takahashi, Takarazuka, Japan, assignors to Sumitomo Chemical Company, Limited, Osaka, Japan Filed May 8, 1972, Ser. No. 251,199 Claims priority, application Japan, May 14, 1971, 46/312,672, 46/32,673 Int. Cl. C07c 6'9/74 US. Cl.
- the present invention relates to a process of producing alkyl chrysanthemates [alkyl 2,2 dimethyl- 3(2- methyl-l-propenyl)-cyclopropanecarboxylates] from an alkyl diazoacetate and 2,5-dimethyl 2,4-hexadiene. More particularly, the present invention relates to a process of continuous production of alkyl chrysanthemates in a high yield wherein the reaction of 2,5-dimethyl 2,4-hexadiene with an alkyl diazoacetate is carried out by using a great excess amount of 2,5-dimethyl 2,4-hexadiene, and also to an apparatus for the production thereof.
- alkyl in this invention means a lower alkyl group having up to 4 carbon atoms.
- the alkyl chrysanthemates are essential intermediate compounds for producing the pyrethroid type insecticides such as allethrin, phthalthrin, etc.
- a general method of production thereof there is known a method wherein a copper powder catalyst is added to 2,5-dimethyl 2,4-hexadiene and then the alkyl diazoacetate is added dropwise, the method being, for example, disclosed by Campbell and Harper in Journal of the Chemical Society, 1945, page 283.
- the present inventors have studied the basis of reaction and have found that it is necessary to use a great excess amount of 2,5-dimethyl 2,4-hexadiene and take the reaction product out of the reaction zone as much as possible in order to obtain the alkyl chrysanthemates in a high yield by preventing side reactions.
- the present inventors have further studied the process for the production of the alkyl chrysanthemate with industrial advantages and have found that when a solution of the alkyl diazoacetate in 2,5-dimethyl 2,4-hexadiene is fed continuously to the reaction zone comprising 2,5-dimethyl 2,4-hexadiene and a copper catalyst, while the resulting alkyl chrysanthemate is continuously taken out of the reaction zone, the alkyl chrysanthemate can be obtained in a high yield with industrial advantages.
- 2,5-dimethyl 2,4-hexadiene is fed to a reaction zone in which a copper catalyst is placed, and is heated to a temperature not lower than 100 C., preferably 100 to 140 C., more preferably 120 to 140 C.
- chrysanthemate may be separated by means of a conventional procedure, for example, by use of a rectifying column, from 2,5-dimethyl 2,4-hcxadiene, which may be reused for dissolving the alkyl diazoacetate.
- the amount of the alkyl diazoacetate is 0.01 to 0.1 mole per mole of 2,5-dimethyl 2,4-hexadiene.
- the concentration of the alkyl diazoacetate in 2,5-dimethyl 2,4-hexadiene is not critical, but preferably is 20 to 70% by weight.
- the catalyst there may be used copper, a powder or granule containing copper, or a copper net.
- FIG. 1 is a diagram of an apparatus useful in carrying out one embodiment of this invention.
- FIG. 2 is a diagram of an apparatus useful in carrying out another embodiment of this invention.
- the process of the present invention may be carried out in the following two manners, i.e. method I wherein the apparatus of FIG. 1 is used and method II wherein the apparatus of FIG. 2 is used.
- a reactor R is provided between a first column A which separates 2,5-dimethyl 2,4- hexadiene from low boiling compounds and a second column B which separates 2,5-dimethyl 2,4-hexadiene from the alkyl chrysanthemate and by-products.
- High purity 2,5-dimethyl 2,4-hexadiene which has been separated from low boiling point compounds is supplied as a reflux into the reactor R in which a copper catalyst or a catalyst containing copper has been placed.
- a solution of the alkyl diazoacetate in 2,5-dimethyl 2,4-hexadiene is added thereto dropwise.
- the amount of the alkyl diazoacetate is from 0.1 mole to 0.01 mole, preferably from 0.04 to 0.02 mole, per mole of 2,5-dimethyl 2,4-hexadiene supplied to the reactor.
- the reaction mixture freed from the catalyst by filtration or sedimentation, is led to the second column B from the reactor R.
- the reaction time which is indicated by the average retention time, is suitably selected within the range of 5 to minutes and is determined depending on the mole ratio of the alkyl diazoacetate to 2,5-dimethyl 2,4-hexadiene. The preferable range is from 20 to 60 minutes when the mole ratio is 0.04 to 0.02 mole.
- reaction column which is packed with copper or a filler containing copper, and which is provided with an inlet at a suitable height of the column, and is connected to a reboiler RB at the bottom thereof.
- the upper part of the column C higher than the inlet has a function of separation of 2,5- dimethyl 2,4-hexadiene from low boiling point compounds, while the part of the column C lower than the inlet constitutes both a reaction zone and a rectifying zone in which a part of 2,5-dimethyl 2,4-hexadiene is separated from the reaction mixture containing the alkyl chrysanthemate.
- a solution of the alkyl diazoacetate in 2,5-dimethyl 2,4-hexadiene is fed continuously to the reaction column through the inlet, while 2,5-dimethyl 2,4- hexadiene is fed in advance to the reboiler RB, which is heated to cause distillation of 2,5-dimethyl 2,4-hexadiene.
- the resulting mixture containing the alkyl chrysanthemate and a remaining part of 2,5-dimethyl 2,4-hexadiene is continuously taken out of the reboiler RB, and may be subjected to the conventional procedure, for example, to the rectification, whereby the alkyl chrysanthemate can be obtained continuously in a high yield, and the remaining part of the 2,5-dimethy1 2,4-hexadiene may be reused for the above mentioned process.
- the amount of the alkyl diazoacetate is from 0.1 mole to 0.01 mole, preferably from 0.04 to 0.02 mole, per mole of 2,5-dimethyl 2,4- hexadiene refluxed.
- the reaction time is suitably selected within the range of from to 120 minutes and is determined depending on the mole ratio of the alkyl diazoacetate to 2,5-dimethyl 2,4-hexadiene.
- the preferable range is from to 30 minutes when the ratio is 0.04 to 0.02 mole.
- the apparatus is arranged as shown in FIG. 1.
- the reactor R is equipped with a means of sedimentation separation for separating the catalyst, through which the reaction mixture is passed.
- a predetermined amount of 2,5-dimethyl 2,4-hexadiene is charged in the reboiler RB and the reactor R.
- the reactor R is then heated for distillation, 30% solution of ethyl diazoacetate in 2,5- dimethyl 2,4-hexadiene is added dropwise to the reactor.
- the reaction conditions and the results are as shown below.
- Example number 1 Reaction temperature, C 133 133 133 Amount of 2,5-dimethyl 2,4-hexadiene, moles/hr. 16. 9 25 20 Amount of ethyl diazoacetate, mole/hr 0. 675 0. 675 0.675 Amount of catalyst with respect to the reaction mixture, percent e 5 e 5 b 5 Reaction time, hr 0. 5 0. 5 0. 2 Yield of ethyl chrysanthemate with respect to ethyl diazoacetate, percent 87. 1 93. 6 97. 3 Yield of ethyl chrysanthemate with respect to 2,5-dimethyl 2,4-hexadiene, percent 94. 6 94. 7 95. 2
- EXAMPLE 4 The apparatus is arranged as shown in FIG. 2.
- the column C is packed with single helix rings.
- a predetermined amount of 2,5-dimethy1 2,4-hexadiene is charged in the reboiler RB which is then heated for distillation.
- 30% solution of ethyl diazoacetate in 2,5-dimethyl 2,4-hexadiene is supplied from the supply inlet to cause the reaction.
- the reaction conditions and the result are as shown below.
- Reaction temperature C 133-136 Reflux amount of 2,5-dimethyl 2,4-hexadiene moles/hr 2.1 Amount of ethyl diazoacetate mole 0.06 Reaction time hour 0.32 Yield of ethyl chrysanthemate with respect to ethyl diazoacetate percent 94.1 Yield of ethyl crysanthemate with respect to 2,5-dimethyl 2,4-hexadiene perccnt 94.9
- Reaction temperature C 127-133 Amount of 2,5-dimethyl 2,4-hexadiene g 100 Ethyl diazoacetate g 100 Reaction time (dropping time) hours 2 Yield of ethyl chrysanthemate with respect to ethyl diazoacetate r -percent- 69.4
- reaction time for the reaction of 2,5-dimethyl 2,4-hexadiene with the alkyl diazoacetate is 5 minutes to minutes.
- reaction time as indicated by an average retention time, is within a range of 5 to 120 minutes.
- reaction time as indicated by a value calculated by dividing the holdup of the column by the reflux amount per minute, is within 5 to 120 minutes.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3267271A JPS5233112B1 (xx) | 1971-05-14 | 1971-05-14 | |
JP3267371A JPS5233113B1 (xx) | 1971-05-14 | 1971-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3808260A true US3808260A (en) | 1974-04-30 |
Family
ID=26371253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00251199A Expired - Lifetime US3808260A (en) | 1971-05-14 | 1972-05-08 | Process for producing alkyl chrysanthemates |
Country Status (8)
Country | Link |
---|---|
US (1) | US3808260A (xx) |
BE (1) | BE783381A (xx) |
CA (1) | CA992092A (xx) |
CH (1) | CH570357A5 (xx) |
DE (1) | DE2223331A1 (xx) |
FR (1) | FR2137824B1 (xx) |
IT (1) | IT966907B (xx) |
NL (1) | NL7206432A (xx) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4332962A (en) * | 1977-03-11 | 1982-06-01 | Imperial Chemical Industries Limited | Preparation of cyclopropane carboxylic acid esters |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3897478A (en) * | 1970-05-21 | 1975-07-29 | Stauffer Chemical Co | Continuous process for the manufacture of alkyl chrysanthemate esters |
DE2916357A1 (de) * | 1979-04-23 | 1980-11-06 | Bayer Ag | Verfahren zur herstellung von 3-(2-aryl-vinyl)-2,2-dimethyl-cyclopropan-1-carbonsaeureestern und neue zwischenprodukte dafuer |
-
1972
- 1972-05-08 US US00251199A patent/US3808260A/en not_active Expired - Lifetime
- 1972-05-11 CA CA142,057A patent/CA992092A/en not_active Expired
- 1972-05-12 CH CH709672A patent/CH570357A5/xx not_active IP Right Cessation
- 1972-05-12 IT IT68500/72A patent/IT966907B/it active
- 1972-05-12 FR FR7217026A patent/FR2137824B1/fr not_active Expired
- 1972-05-12 NL NL7206432A patent/NL7206432A/xx not_active Application Discontinuation
- 1972-05-12 DE DE19722223331 patent/DE2223331A1/de not_active Withdrawn
- 1972-05-12 BE BE783381A patent/BE783381A/xx not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4332962A (en) * | 1977-03-11 | 1982-06-01 | Imperial Chemical Industries Limited | Preparation of cyclopropane carboxylic acid esters |
Also Published As
Publication number | Publication date |
---|---|
CA992092A (en) | 1976-06-29 |
FR2137824A1 (xx) | 1972-12-29 |
FR2137824B1 (xx) | 1980-03-14 |
BE783381A (fr) | 1972-09-01 |
NL7206432A (xx) | 1972-11-16 |
DE2223331A1 (de) | 1972-11-23 |
CH570357A5 (xx) | 1975-12-15 |
IT966907B (it) | 1974-02-20 |
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