| 摘要 |
NEW MATERIAL:A compound shown by the formula I (R is 2-12C n-alkyl; *mark is optically active center; m is 0 or 1; Y is single bound, 1,4-di- substituted phenyl, or trans-1,4-substituted cyclohexylene; R' is 1-12C alkyl, or alkoxy; X1-X4 are H, or F and at least one of them is F; Z is -COO-, or -OCO-). EXAMPLE:(-)-4-(2-Octyloxy)-benzoic acid-3'-fluoro-4'-hexyloxyphenyl ester. USE:One component for a ferroelectric smectic liquid crystal composition, having high spontaneous polarization, chemical stability, usable as a display element or electro-optical element having improved reliability and high-speed response. PREPARATION:A compound shown by the formula III is reacted with a compound shown by the formula II in the presence of a basic compound such as pyridine, etc., to give a compound shown by the formula IV, which is etherified with a compound shown by the formula V in the presence of a basic compound such as K2CO3, etc., to give a compound shown by the formula I.
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