DE1618266C3 - Process for the preparation of 1,2,4-trimethyl-5-isopropylbenzene - Google Patents
Process for the preparation of 1,2,4-trimethyl-5-isopropylbenzeneInfo
- Publication number
- DE1618266C3 DE1618266C3 DE19671618266 DE1618266A DE1618266C3 DE 1618266 C3 DE1618266 C3 DE 1618266C3 DE 19671618266 DE19671618266 DE 19671618266 DE 1618266 A DE1618266 A DE 1618266A DE 1618266 C3 DE1618266 C3 DE 1618266C3
- Authority
- DE
- Germany
- Prior art keywords
- pseudocumene
- propene
- mol
- isopropylbenzene
- trimethyl
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
- C07C2/66—Catalytic processes
- C07C2/68—Catalytic processes with halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- C07C2527/06—Halogens; Compounds thereof
- C07C2527/125—Compounds comprising a halogen and scandium, yttrium, aluminium, gallium, indium or thallium
- C07C2527/126—Aluminium chloride
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
deshalb während der Reaktion portionsweise so ergänzt werden, daß sich jeweils 1% AlCl1 im Reaktionsgefäß befand.therefore added in portions during the reaction so that there was 1% AlCl 1 in the reaction vessel.
Die je Stunde erhaltenen Produktmengen wurden wie im Beispiel 1 gemeinsam aufgearbeitet und gaschromatographisch analysiert.The amounts of product obtained per hour were worked up together as in Example 1 and by gas chromatography analyzed.
Gesamtausbeute an l,2,4-Trimethyl-5(6)-isopropylbenzol 80(20) nach einer Reaktionsdauer von 60 Stunden: 35,4 kg entsprechend 98,5% der Theorie.Total yield of 1,2,4-trimethyl-5 (6) -isopropylbenzene 80 (20) after a reaction time of 60 hours: 35.4 kg corresponding to 98.5% of theory.
Die mit der Erfindung erzielten Vorteile bestehen neben einer erheblichen Ausbeuteverbesserung darin, daß das so hergestellte l,2,4-Trimethyl-5-isopropylbenzol frei von Durol, Isodurol und anderen durch Isomerisierung entstandenen Alkylbenzolen ist. Bei Einhaltung der erfindungsgemäßen Reaktionsbedingungen kann der Gehalt an l,2,4-Trimethyl-6-isopropylbenzol auf 20% des Reaktionsproduktes gesenkt werden.The advantages achieved with the invention are, in addition to a significant improvement in yield, in that the l, 2,4-trimethyl-5-isopropylbenzene produced in this way is free from durol, isodurol and others Isomerization resulting alkylbenzenes is. If the reaction conditions according to the invention are adhered to the 1,2,4-trimethyl-6-isopropylbenzene content can be reduced to 20% of the reaction product will.
Claims (1)
AICIj als Katalysator bei Temperaturen bis zuProcess for the preparation of 1,2,4-trimethyl- customary anhydrous aluminum (III) chloride ver-5-isopropylbenzene by alkylating pseudo-5 are used; no special protective measures are necessary to keep the salt dry.
AICIj as a catalyst at temperatures up to
Propen in Gegenwart von Aluminium(III)-chlorid. Die Reaktion wurde fortgeführt, bis 42 g (1 MoI)The invention relates to a process for producing cooling, the reaction temperature of 30 0 C of l, 2,4-trimethyl-5-isopropylbenzene maintained by alkylene. There was no exhaust gas, the introduced pseudocumene with a deficit of propene was quantitatively implemented.
Propene in the presence of aluminum (III) chloride. The reaction was continued until 42 g (1 mol)
entsteh mit 60% Gesamtausbeute ein Gemisch aus Zwischenfraktion und Rückstand 3 g.(USA -PatentMhrift 3 132 18?) After this procedure 35 2 . l p raction bp 76 in H g : 220 to 222 ° C 160 g;
a mixture of intermediate fraction and residue 3 g results with a total yield of 60%.
Tetraalkylbenzolen etwa 25%. Außerdem enthält . .
das Gemisch noch etwa 15% Tsodurol. B e 1 s ρ 1 e I 2Tetraalkylbenzenes which, according to the information in the cited publication, consist of about 45% 1,2,4-trimethyl. The 160 g of fraction 2 correspond to 98.8% of 5-isopropylbenzene and about 15% durol. It prey on tetraalkylbenzenes. However, reaction and reaction can be determined by gas chromatography at 4 °. tion products were determined by gas chromatography to show that the production of 1,2,4-trimethyl-100-m-KapillarsäuIe (silicone oil DC 550) was checked (per-5-isopropylbenzene always from the formation of 1,2,4-trinine -Elmer F 6, FiD detector). It was found that methyl-6-isopropylbenzene is accompanied. In the process known from fraction 2 from l ^^ - trimethyl-S-isopropyl, the proportion of 1,2,4-tri-benzene and 1,2,4-trimethyl-6-isopropylbenzene in methyl-6-isopropylbenzene is in the Overall yield consisted of 45 weight ratio 80:20.
Tetraalkylbenzenes about 25%. Also contains. .
the mixture still has about 15% tsodurol. B e 1 s ρ 1 e I 2
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED0052206 | 1967-02-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1618266A1 DE1618266A1 (en) | 1970-05-06 |
DE1618266B2 DE1618266B2 (en) | 1973-11-29 |
DE1618266C3 true DE1618266C3 (en) | 1974-07-04 |
Family
ID=7053990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19671618266 Expired DE1618266C3 (en) | 1967-02-06 | 1967-02-06 | Process for the preparation of 1,2,4-trimethyl-5-isopropylbenzene |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1618266C3 (en) |
-
1967
- 1967-02-06 DE DE19671618266 patent/DE1618266C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1618266A1 (en) | 1970-05-06 |
DE1618266B2 (en) | 1973-11-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
8339 | Ceased/non-payment of the annual fee |