Phenyl polyhaloalkyl ether derivatives, liquid-crystal composition containing the same, and liquid-crystal display element

Abstract

The invention is to provide novel liquid crystalline compounds exhibiting particularly high Δε, excellent miscibility with other liquid crystalline compounds, and nematic phase in a wide temperature range without impairing characteristics peculiar to liquid crystalline compounds having fluorine atom; to provide liquid crystal compositions comprising the compound; and to provide liquid crystal display devices fabricated by using the composition; the compounds are phenylpolyhaloalkyl ether derivatives expressed by the general formula (1) 1 wherein X1 and X2 independently represent 1,2-ethylene group, 1,4-butylene group, or covalent bond provided that in no case are both X1 and X2 simultaneously a covalent bond; R1 represents an alkyl group having 1 to 20 carbon atoms in which alkyl group methylene group may be replaced by oxygen atom, vinylene group, or ethynylene group; Y1 represents —OCF2CFH—(CF2)n—F (n is 0, 1, 2, or 3) or —OCF2Cl; rings A1 and A2 independently represent 1,4-cyclohexylene ring, 1,4-cyclohexenylene ring, or 1,4-phenylene ring, A3 represents 1,4-phenylene ring, and the carbon atom in these rings may be replaced by oxygen atom or nitrogen atom, and the hydrogen atom on the rings may be replaced by fluorine atom or chlorine atom, respectively; m is 0 or 1; and each element which constitutes the compound may be its isotope.

Dependencies are inferred from the claim text.