Liquid crystal compound having fluorine-substituted 1,4-phenylene moiety, liquid crystal composition and liquid crystal display element

摘要

A compound represented by the following general formula (1) is provided. This has broader temperature range of nematic phase, lower viscosity and higher miscibility with other liquid crystal compounds at low temperature than those of conventional liquid crystal compounds, and the compounds have high chemical stability. wherein H1 to H8 represent independently a hydrogen atom or a halogen atom, provided that at least one of them is a halogen atom; R1 represents a moiety which is an alkyl group having 2 to 20 carbon atoms provided that one or more methylene groups (-CH2-) which are not successive in the alkyl group are replaced with an oxygen atom (-O-) in the form of ether; Y1 represents an alkyl group having 1 to 20 carbon atoms, and one or more methylene groups in Y1 independently may be replaced with an oxygen atom, a sulfur atom, a dihydroxysilyl group, a dimethylsililene group, -CH=CH- or -C 3BOND C-; X1 to X3 represent independently a covalent bond, a 1,2-ethylene group or a 1,4-butylene group.