| abstract |
There is herein disclosed a compound represented by general formula (1) wherein R1 is an alkadienyl group having 4 to 10 carbon atoms in which a hydrogen atom may be substituted by a fluorine atom or the like; R2 is an alkenyl group having 1 to 10 carbon atoms in which a hydrogen atom may be substituted by a fluorine atom or the like; one or more non-adjacent methylene groups (-CH2-) in the alkadienyl group or the alkenyl group may be replaced by -O- or the like; rings A1, A2, A3 and A4 are each 1,4-cyclohexylene, 1,4-phenylene or the like in which a hydrogen atom may be substituted by a halogen atom; Z1, Z2 and Z3 are each a single bond, -CH2CH2-, -CF=CF- or the like; p and q are each 0 or 1. The above compound has a large elastic constant ratio, steep electro-optic characteristics and a little temperature dependence in a low temperature range, and so it is useful for the manufacture of a liquid crystal display device. |