| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject compound, whose main structure is modified with fluorine at the optimal position, capable of exhibiting stable antiferroelectricity around the ambient temperature, having small temperature dependency in a response speed and useful for displaying. SOLUTION: This compound of formula I (R<1> is a 4-16C alkyl; R<2> is a 4-10C alkyl; the mark * indicates an optically active carbon), e.g. 4-(2- octyloxycarbonyl)-3-fluorophenyl-4'-n-nonyloxy-2-fluorobiphnyl-4-carbo xylate. Preferably,μI (an indicator expressing temperature dependency) expressed by formula II (τ<30> is a response speed at 30 deg.C, andτ<60> is a response speed at 60 deg.C) is >1.0 and <=1.8. The compound may be obtained e.g. through the reaction of 4'-alkyloxy-3-fluoro-4-biphenylcarboxylic acid with a chlorinating agent such as thionyl chloride.
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