| 摘要 |
NEW MATERIAL:The trans-4-(4-substituted phenyl)cyclohexanecarboxylic acid 3- fluoro-4-cyanophenyl ester of formula I (R is 1-10C alkyl or alkyloxy). USE:A liquid crystal composition. It has large positive dielectric anisotropy of about +18, broad liquid crystal temperature range, high clear point, and excellent stability and compatibility. PREPARATION:The compound of formula I can be prepared by reacting the trans-4-(4-substituted phenyl)cyclohexanecarboxylic acid chloride of formula IIwith 3-fluoro-4-cyanophenol of formula III in the presence of pyridine.
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