引用本文:
杨永忠, 高仁孝, 刘鸿, 李启贵, 刘骞峰. 反-4-(反-4'-丙基环己基)环己基甲酸的新合成方法[J]. 应用化学,
2004, 21(9): 971-972.
Citation: YANG Yong-Zhong, GAO Ren-Xiao, LIU Hong, LI Qi-Gui, LIU Qian-Feng. A Novel Approach to the Synthesis of trans-4-(trans-4'-Propylcyclohexyl) cyclohexylcarboxylic Acid[J]. Chinese Journal of Applied Chemistry, 2004, 21(9): 971-972.
Citation: YANG Yong-Zhong, GAO Ren-Xiao, LIU Hong, LI Qi-Gui, LIU Qian-Feng. A Novel Approach to the Synthesis of trans-4-(trans-4'-Propylcyclohexyl) cyclohexylcarboxylic Acid[J]. Chinese Journal of Applied Chemistry, 2004, 21(9): 971-972.
反-4-(反-4'-丙基环己基)环己基甲酸的新合成方法
摘要:
环己烷类液晶具有较高的相变温度和较低的粘度,克服了目前仍广泛使用的联苯类液晶相变温度低、粘度大、响应速度较慢的缺点,这类液晶材料已日益成为中高档混合液晶材料不可缺少的有效组分[1]。反-4-(反-4'-丙基环己基)环己基甲酸(trans-3HHA)是合成这类液晶材料很重要的中间体,因此,它的合成具有重要应用价值。trans-3HHA合成需经2步反应:加氢和异构化。加氢反应以4-(反-4'-丙基环己基)苯甲酸(3HPA)为反应物,在加氢催化剂存在下,生成包含trans-3HHA和顺-4-(反-4'-丙基环己基)环己基甲酸(cis-3HHA)2种异构体的混合物(合称3HHA)。
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关键词:
- 反(反丙基环己基)环己基甲酸
- / 反丙基环己基苯甲酸
- / 异构化
English
A Novel Approach to the Synthesis of trans-4-(trans-4'-Propylcyclohexyl) cyclohexylcarboxylic Acid
Abstract:
The isomeric mixtures containing trans and cis forms of 4-(trans-4'-propylcyclohexyl) cyclohexylcarboxylic acid (3HHA) was produced by hydrogenation of 4-(trans-4'-propylcyclohexyl) benzoic acid (3HPA) at 105℃ and 5 MPa using ruthenium/carbon as catalysts.The isomerization reaction was performed in the absence of solvent at 200℃ when the molar ratio of potassium hydroxide catalyst to 3HHA was 2.0 to 1.0.The product in a mass ratio of trans-4-(trans-4'-propylcyclohexyl) cyclohexylcarboxylic acid (trans-3HHA) to cis-4-4-(trans-4'-propylcyclohexyl) cyclohexylcarboxylic acid (cis-3HHA) of 98:2 was obtained.
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