| 摘要 |
NEW MATERIAL:A liquid crystal compound of formula I (R and R' are 1-9C alkyl; ring X is benzene ring or cyclohexane ring). USE:Useful as one compounding component in liquid crystal compositions, and capable of enlarging the operation temperature range of liquid crystal display elements and imparting high-speed response. PREPARATION:A compound of formula II is reduced with a reducing agent, e.g. NaBH4, in an organic solvent, e.g. ethanol or pyridine, to give a compound, which is then chlorinated with a chlorinating agent, e.g. SOCl2, in an inert solvent, e.g. benzene, in the presence of pyridine, etc. under heating to afford a compound of formula III, which is reacted with a compound of formula IV to afford the aimed compound of formula I . The compound of formula IV is synthesized by reacting a 1-alkyl-4-phenylcylohexane with acetic anhydride in the presence of anhydrous AlCl2 in an organic solvent, and hydrolyzing the resultant acetylated compound with an alkali.
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