NEUE FLÜSSIGKRISTALLINE VERBINDUNGEN DIE EINE DIENYLGRUPPE ENTHALTEN UND FLÜSSIGKRISTALLINE ZUSAMMENSETZUNGEN

摘要

The present invention is to provide a liquid crystalline compound which has a large ratio of elastic constants and low viscosity, is excellent in miscibility, and is even chemically stable, and to provide a liquid crystal composition containing the liquid crystalline compound. The present invention is concerned with a liquid crystalline compound expressed by general formula (1) wherein R1 represents cyano group, halogen atom, or a straight or branched alkyl group or halogenated alkyl group having 1 to 20 carbon atoms, one or not-adjacent two CH2 groups in the alkyl group or halogenated alkyl group may be replaced by oxygen atom or -CH=CH- group; R2 and R2' represent hydrogen atom, halogen atom, or an alkyl group having 1 to 9 carbon atoms; X1, X2, and X3 independently represent -CH2CH2-, -CO-O-, -O-CO-, -CH=CH-, -C IDENTICAL C-, -(CH2)4-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, or a covalent bond; rings A, B, C, and D independently represent 1,4-phenylene ring, trans-1,4-cyclohexylene ring, bicycloÄ1,1,0Übutane ring, bicycloÄ1,1,1Üpentane ring, bicycloÄ3,2,2Üoctane ring, cyclobutane ring, or spiroÄ3,3Üheptane ring, respectively, hydrogen atom in these rings may be replaced by halogen atom and carbon atom in these rings may be replaced by nitrogen atom or oxygen atom; l , m, and o are independently 0 or 1, n is an integer of 0 to 3, and p is an integer of 1 to 5. Liquid crystal composition having excellent physical properties, that is, steep threshold characteristics and high response speed can be obtained by providing a novel liquid crystalline compound having a large ratio of elastic constants and low viscosity, or by including the liquid crystalline compound in a liquid crystal composition.