申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US07777081B2
公开(公告)日:2010-08-17
A process for effectively producing a 4-(4-alkylcyclohexyl)benzaldehyde, 4-(cyclohexyl)benzaldehyde, a 4-(trans-4-alkylcyclohexyl)benzaldehyde and a (trans-4-alkylcyclohexyl)benzene useful for electronic material applications such as liquid crystals and for pharmaceutical and agrochemical applications, etc., are disclosed. The present invention provides (1) a process for producing a 4-(4-alkylcyclohexyl)benzaldehyde or 4-(cyclohexyl)benzaldehyde by formylating a (4-alkylcyclohexyl)benzene or cyclohexylbenzene with carbon monoxide, (2) a process for producing a 4-(trans-4-alkylcyclohexyl)benzaldehyde by formylating a (4-alkylcyclohexyl)benzene having a cis/trans molar ratio of 0.3 or less with carbon monoxide, and (3) a process for producing a (trans-4-alkylcyclohexyl)benzene by isomerizing a mixture of the cis and trans isomers of a (4-alkylcyclohexyl)benzene, all of the processes being performed in the presence of HF and BF3.
本发明公开了一种有效生产4-(4-烷基环己基)苯甲醛、4-(环己基)苯甲醛、4-(反-4-烷基环己基)苯甲醛和(反-4-烷基环己基)苯等电子材料应用,如液晶以及制药和农药应用等的工艺。本发明提供了以下工艺:(1)通过使用一氧化碳对(4-烷基环己基)苯或环己基苯进行甲酰化反应,生产4-(4-烷基环己基)苯甲醛或4-(环己基)苯甲醛;(2)通过使用一氧化碳对具有顺反异构体摩尔比小于0.3的(4-烷基环己基)苯进行甲酰化反应,生产4-(反-4-烷基环己基)苯甲醛;(3)通过异构化混合物的顺反异构体(4-烷基环己基)苯,生产(反-4-烷基环己基)苯,所有工艺均在HF和BF3的存在下进行。