Patent ID: 7300604

Claim:
A compound selected from the groups consisting of Formula (1), (2), (3) and (4): wherein in Formula (1), (2), (3) and (4), R 1 is a hydrogen atom, a fluorine atom, a chlorine atom, —CN, —NO 2 or an alkyl group having 1 to 20 carbon atoms; in the alkyl group, an optional hydrogen atom may be substituted with a fluorine atom or a chlorine atom, and optional one or two —CH 2 — may be substituted with —O—, —S—, —COO—, —OCO—, —CO—, —CH═CH— or —C≡C—; R 2 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and an optional hydrogen atom in the alkyl group may be substituted with a fluorine atom or a chlorine atom; A 1 is independently a 1,4-cyclohexylene group, a 1,4-phenylene group, a 4,4′-biphenylene group, a 4,4′-terphenylene group, a pyridine-2,5-diyl group, a naphthalene-2,6-diyl group or a tetrahydronaphthalene-2,6-diyl group; in the 1,4-phenylene group, an optional hydrogen atom may be substituted with a fluorine atom or a chlorine atom, and optional one or two hydrogen atoms may be substituted with cyano, methyl, ethyl, methoxy, acetoxy, acetyl or trifluoromethyl; A 2 is independently a 1,4-cyclohexylene group, a 1,4-phenylene group, a 4,4′-biphenylene group, a 4,4′-terphenylene group, a pyridine-2,5-diyl group, a pyridazine-3,6-diyl group, a pyrimidine-2,5-diyl group, a fluorene-2,7-diyl group, a 9-methylfluorene-2,7-diyl group, a 9,9-dimethylfluorene-2,7-diyl group, a naphthalene-2,6-diyl group or a tetrahydronaphthalene-2,6-diyl group; in the 1,4-phenylene group, an optional hydrogen atom may be substituted with a fluorine atom or a chlorine atom, and optional one or two hydrogen atoms may be substituted with cyano, methyl, ethyl, methoxy, hydroxy, formyl, acetoxy, acetyl or trifluoromethyl; X is independently a single bond, —(CH 2 ) 2 —, —CH═CH—, —C≡C—, —CH 2 O —, —OCH 2 —, —CF 2 O—, —OCF 2 —, —COO—, —OCO—, —CONH—, —NHCO—, —(CH 2 ) 4 —, —(CH 2 ) 2 COO—, —OCO(CH 2 ) 2 —, —CH═CH—COO— or —OCO—CH═CH—; P is independently an alkylene group having 1 to 20 carbon atoms; in the alkylene group, an optional hydrogen atom may be substituted with a fluorine atom or a chlorine atom, optional —CH 2 — may be substituted with —O—, optional one or two —CH 2 — may be substituted with —COO— or —OCO—, and optional one —CH 2 — may be substituted with —CH═CH— or —C≡C—; and p and q each are independently 0, 1 or 2.