PURPOSE: To obtain a new terphenyl derivative, useful as an electrooptical display material and having a wide nematic liquid crystal temperature range.
CONSTITUTION: A liquid crystal composition is obtained by including a terphenyl derivative expressed by formula 1 (R1 and R2 are 1-10C straight-chain alkyl), e.g. 2',5'-difluoro-4,4"-dipentylterphenyl. The compound expressed by formula 1 is obtained by reacting a compound expressed by formula 2 with a compound expressed by formula 3 in the presence of tetrakistriphenylphosphinepalladium in a mixed solvent of an aqueous solution of sodium carbonate, benzene and ethanol, providing a compound expressed by formula 4 and further reacting the resultant compound expressed by formula 4 with a compound expressed by formula 5 in the presence of the tetrakistriphenylphosphinepalladium, in a mixture of an aqueous solution of sodium carbonate with benzene and ethanol. A liquid crystal composition is prepared by including at least one of the terphenyl derivatives expressed by formula 1. Furthermore, a liquid crystal display element is produced by using the above-mentioned liquid crystal composition.
IKUKAWA SHIYUUJI
NAKAYAMA SANEKO
YUDASAKA YOSHIO
