LIQUID CRYSTAL COMPOUND AND LIQUID CRYSTAL COMPOSITION

NEW MATERIAL:The compound of formula I (R1 is 1-18C alkyl or alkoxy; R* is optically active alkyl). EXAMPLE:5-(p-Octyloxyphenyl)pyrazine-2-carboxylic acid 4'-methylhexyl ester. USE:A component of a liquid crystal composition. It is a liquid crystal compound useful as a ferroelectric chiral smec...

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Bibliographische Detailangaben
Hauptverfasser:	OGIWARA SHINEI, SEGAWA HIROZO, KATAGIRI KAZUHARU, SHINJO KENJI, YOSHINAGA KAZUO, NAKAMURA AKIRA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES HETEROCYCLIC COMPOUNDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC CHEMISTRY PAINTS POLISHES
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Beschreibung
Zusammenfassung:	NEW MATERIAL:The compound of formula I (R1 is 1-18C alkyl or alkoxy; R* is optically active alkyl). EXAMPLE:5-(p-Octyloxyphenyl)pyrazine-2-carboxylic acid 4'-methylhexyl ester. USE:A component of a liquid crystal composition. It is a liquid crystal compound useful as a ferroelectric chiral smectic liquid crystal or liquid crystal composition having excellent threshold characteristics to electric field response. It can be used as a ferroelectric liquid crystal element material for a high-resolution large-sized display element or a TN-type liquid crystal element having improved threshold characteristics. PREPARATION:The objective compound of formula I can be produced by hydrolyzing the 2,3-dicyanopyrazine derivative of formula II with NaOH, etc., decarbonating the hydrolyzed product, halogenating the resultant 2-carboxypyrazine derivative of formula III with SOCl2, etc., to obtain an acid halide and esterifying the halide with an optically active compound of formula HO-R*.