ESTER COMPOUNDS, LIQUID CRYSTAL COMPOSITIONS AND LIQUID CRYSTAL DISPLAY DEVICES

摘要

The present invention is to provide liquid crystalline compounds suitable for driving at a low voltage and at a wide temperature range, and are suitable for high speed response, to provide liquid crystal compositions comprising the compound, and to provide liquid crystal display devices comprising the liquid crystal composition; the crystalline compounds are ester compounds expressed by the general formula (1) wherein R1 represents hydrogen atom, cyano group, nitro group, amino group, a halogen atom, a straight chain or branched alkyl group having 1 to 20 carbon atoms, or a straight chain or branched alkenyl group having 2 to 20 carbon atoms; one or more hydrogen atoms in these alkyl group and alkenyl group may be replaced by halogen atoms; one or more -CH2- in these alkyl group and alkenyl group may be replaced by oxygen atoms or sulfur atoms, but there is no case where oxygen atoms are adjacent; and one or more carbon atoms in these alkyl group and alkenyl group may be replaced by silicon atoms; A1 to A5 each independently represent 1,4-cyclohexylene, 1,4-phenylene, 1-cyclohexene-1,4-diyl, 3-cyclohexene-1,4-diyl, 1-sila-1,4-cyclohexylene, or 4-sila-1,4-cyclohexylene; one or more -CH2- in the 1,4-cyclohexylene, 1-cyclohexene-1,4-diyl, and 3-cyclohexene-1,4-diyl may each independently be replaced by oxygen atoms, sulfur atoms, -CO-, -CS-, SiH2-, -NH-, -CF2-, or -CFH-, but there is no case where oxygen atoms are adjacent; hydrogen atoms which bond to carbon atoms at position 2 and position 3, respectively, in the 1-cyclohexene-1,4-diyl or 3-cyclohexene-1,4-diyl may each independently be replaced by fluorine atoms; one or more hydrogen atoms in the 1,4-phenylene may each independently be replaced by halogen atoms, halogenated alkyl groups having 1 to 3 carbon atoms, methyl groups, cyano groups, or nitro groups; and one or more -CH= in the 1,4-phenylene may each independently be replaced by nitrogen atoms; bonding groups Za to Zd each independently represent single bond, -CH2-, -O-, -C IDENTICAL C-, or an alkylene group or alkenylene group having 2 to 4 carbon atoms; one or more hydrogen atoms in these groups may be replaced by halogen atoms; and -CH2- in these groups may each independently be replaced by oxygen atom, sulfur atom, -CO-, -CS-, -NH-, -CF2-, or -CFH-, but there is no case where oxygen atoms are adjacent; bonding group Ze represents single bond, an alkylene group or alkenylene group having 1 to 10 carbon atoms; and -CH2- in these groups may each independently be replaced by oxygen atom, sulfur atom, -CO-, -CF2-, -CFH-, -CH=CH-, -CF=CF-, -CF=CH-, or -C IDENTICAL C-, but there is no case where oxygen atoms are adjacent; n1 to n3 are each independently 0 or 1, but n1