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 BF
3
.
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、制药和农药应用等的方法。本发明提供了(1)一种通过将(4-烷基环己基)苯或
环己基苯与
一氧化碳进行甲酰化反应来生产4-(4-烷基环己基)
苯甲醛或4-(环己基)
苯甲醛的方法,(2)一种通过将具有顺反异构体摩尔比小于0.3的(4-烷基环己基)苯与
一氧化碳进行甲酰化反应来生产4-(反-4-烷基环己基)
苯甲醛的方法,以及(3)一种通过异构化(4-烷基环己基)苯的顺反异构体混合物来生产(反-4-烷基环己基)苯的方法,所有这些方法都在HF和
BF3的存在下进行。