Patent ID: 7785675

Claim:
A compound represented by the general formula (II): wherein R 1 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, where the alkyl group may contain unsaturated bonds, any —CH 2 — unit of the alkyl group may be replaced by —O—, —CO—, —COO—, or —SiH 2 — and part or all of hydrogen atoms may be replaced by halogen atom or cyano group; ring A is 1,4-phenylene (wherein —CH═ may be replaced by —N═), unsubstituted 1,4-trans-cyclohexylene (wherein —CH 2 — may be replaced by —O— or —S—), or 2,6-naphthylene group, and any hydrogen atom of ring A may be replaced by a halogen atom, a cyano, alkyl, or alkoxy group; Z 1 is —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CH 2 CH 2 —, —CH═CH—, —C≡C—, or a single bond, and any hydrogen atom of Z 1 may be replaced by a fluorine atom; m is 1 or 2 and when m is 2, ring A and Z 1 that are repeated may be different, respectively; n is 0 or 1; X 1 and X 2 are each independently alkyl or alkoxy group with 1 to 3 carbon atoms, or a hydrogen atom, where if either X 1 or X 2 is hydrogen, the other must not be hydrogen; and Y 1 and Y 2 are each independently a hydrogen, fluorine, or chlorine atom.