Liquid crystalline compound having a difluoropropyleneoxy group as bonding group, liquid crystal composition and liquid crystal display element

摘要

The present invention provides a liquid crystalline compound having a difluoropropyleneoxy group as a bonding group, which is represented by Formula (1): wherein R<1> and R<2> each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 20 carbon atoms; rings A<1> to A<5> each independently represent a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group; Z<1> to Z<4> each independently represent a single bond, -CH2CH2-, -CH2O-, -OCH2-, -COO-, -OCO-, -CH=CH-, -C IDENTICAL C-, -CF2O- or -OCF2-; Y<1>, Y<2>, Y<3> and Y<4> each independently represent hydrogen or fluorine; and k, 1, m and n each independently represent 0 or 1. This liquid crystalline compound has a large absolute value ( DELTA epsilon ) of a dielectric anisotropy and shows a relatively small refractive anisotropy. The present invention further provides a liquid crystal composition comprising this compound which makes it possible to drive display elements of various modes at a low voltage, and a liquid crystal display element containing this liquid crystal composition.