Tian Hui-qiang
2010
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Abstract
Tans-4-[trans-4-(4-trifluoromethoxyphenyl)cyclohexane]-cyclohexane-1-ethylene liquid crystal compound was synthesized from 4-(trifluoromethoxy)bromobenzene and 4,4'dicyclohexanedione mono-ethylene ketal by Grignard reaction、dehydration、hydrogenation,deprotection,transconformation,witting reaction,hydrolization,transconformation and wittig reaction.the best catalyst was Pd/C;for dehydration,the best solvent was xylene,reaction time was 4h.The overall yield and purity of the target compound was about 27.8% and 99.5%(GC),the structure was characterized by IR,1H NMR and MS.