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Citation: YANG Jian-Ming, WANG Hu-Sheng, LÜ Jian, AN Zhong-Wei. Hydrogenation of 4-Alklybenzoic Acids and Effect of the Alkyl Group[J]. Chinese Journal of Applied Chemistry, ;2002, 19(4): 364-368. shu

Hydrogenation of 4-Alklybenzoic Acids and Effect of the Alkyl Group

1.
Xi'an Modern Chemistry Research Institute, Xi'an 710065

Corresponding author: LÜ Jian,
Received Date: 10 September 2001
Available Online: 19 November 2001

4-Alkyl-cyclohexanecarboxylic acids as liquid crystal intermediates were synthesized from hydrogenation of 4-alkylbenzoic acids over Raney Ni. The relation of the alkyl group with the conformational isomer has been investigated. It is found that the longer the length of the alkyl group, the slower the conversion of the acid in NaOH solution. The hydrogen pressure of 7.1 MPa was found to be enough for hydrogenation in a mixed solvent of THF and cyclohexane. The trans/cis isomer ratio of the products was more than 2, and the transformation free energy of the conformational isomer increased with the increase of the carbon atom numbers of the alkyl group.
- alkylcy clohexanecarboxylic acid,
- alkylbenzoic acid,
- catalytic hydrogenation
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