申请人:Kawasaki Kasei Chemicals Ltd.
公开号:US04467112A1
公开(公告)日:1984-08-21
p-n-Alkylbenzoic acids having high purity without containing isomers are important as intermediates for liquid crystals. The p-n-alkylbenzoic acid is produced by reacting a p-formylbenzoic acid or its ester with a ketone having the formula ##STR1## wherein R represents a C.sub.1 -C.sub.18 n-alkyl or n-alkenyl group in the presence of a basic catalyst to obtain an unsaturated ketone compound having the formula ##STR2## wherein R is defined above and X represents hydrogen atom or a C.sub.1 -C.sub.6 alkyl group, and then, hydrogenating and reducing the unsaturated ketone compound to obtain the p-n-alkylbenzoic acid having the formula ##STR3##
高纯度且不含异构体的p-n-烷基苯甲酸是液晶中间体的重要组成部分。p-n-烷基苯甲酸是通过在碱性催化剂存在下,将p-甲酰基苯甲酸或其酯与具有以下式子的酮反应而制得:##STR1## 其中R代表C.sub.1-C.sub.18的n-烷基或n-烯基,以获得具有以下式子的不饱和酮化合物:##STR2## 其中R如上所定义,X代表氢原子或C.sub.1-C.sub.6烷基,然后将不饱和酮化合物加氢还原以获得具有以下式子的p-n-烷基苯甲酸:##STR3##