Liquid crystal compound and liquid crystal composition

Abstract

Abstract NEW MATERIAL:The compound of formula I (R is 1-18C alkyl or alkoxy; m is 0 or 1; when m is 0, R' is 1-18C alkyl, and when m is 1, R' is R). EXAMPLE:p-Octyloxyphenyl 5-(p-octyloxyphenyl)pyrazine-2-carboxylate. USE:Material for improving the performance of a ferroelectric liquid crystal element material and TN-type liquid crystal element. A liquid crystal compound having excellent threshold characteristics to electric response, effective to prevent the cross-talk in a display containing a ferroelectric chiral smectic liquid crystal driven by simple matrix electrode, giving high contrast and usable as a precision large-area display. PREPARATION:The compound of formula I can be produced by hydrolyzing the 2,3-dicyanopyrazine derivative of formula II, decarbonating the hydrolysis product, halogenating the resultant compound of formula II to an acid halide and esterifying the halide with the compound of formula IV.

Inventors

• 👤 Kazuo Yoshinaga
• 👤 和夫 吉永
• 👤 Kazuharu Katagiri
• 👤 片桐　一春
• 👤 Akira Nakamura
• 👤 晶 中村
• 👤 Shinei Ogiwara
• 👤 荻原　信栄

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