| abstract |
A novel liquid crystalline compound having a low viscosity and a high elastic constant ratio and at the same time, a superior compatibility with other known liquid crystalline compounds, and a liquid crystal composition and a liquid crystal display element containing the novel compound, are provided. The compound is an alkenylcyclohexane derivative expressed by the formula (1): <IMAGE> (1) wherein R1 and R2 represent a linear or branched alkyl group of 1 to 15 carbon atoms or alkenyl group of 2 to 15 carbon atoms; at least one of R1 and R2 represents an alkenyl group; in these groups, one or more non-adjacent CH2 groups may be replaced by oxygen atom, sulfur atom or -C 3BOND C- group; ring A1, ring A2 and ring A3 each independently represent 1,4-cyclohexylene group wherein one or more CH2 groups on the ring may be replaced by oxygen atom or sulfur atom, or 1,4-phenylene group wherein one or more CH groups on the ring may be replaced by nitrogen atom; Z1 and Z2 each independently represent -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C 3BOND C- or single bond; Z3 represents -(CH2)4-, -CH=CH-(CH2)2-, -CH2-CH=CH-CH2- or -(CH2)2-CH=CH-; and m, n and i each independently represent 0 or 1. |