| 摘要 |
The invention relates to compounds represented by Formula (1): wherein Ra is independently halogen, cyano, —CF3, —CF2H, —CFH2, —OCF3, —OCF2H, —N═C═O, —N═C═S or alkyl having a carbon number of approximately 1 to approximately 20; in the alkyl, optional —CH2— may be substituted with —O—, —S—, —SO2—, —CO—, —COO—, —OCO—, —CH═CH—, —CF═CF— or —C≡C—, and optional hydrogen may be substituted with halogen; Rb is fluorine or —CF3; A is independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene-2,7-diyl or bicyclo[2.2.2]octane-1,4-diyl; in these rings, optional —CH2— may be substituted with —O—, optional —CH═may be substituted with —N═, and optional hydrogen may be substituted with halogen, alkyl having a carbon number of approximately 1 to approximately 5 or halogenated alkyl having a carbon number of approximately 1 to approximately 5; Z is independently a single bond or alkylene having a carbon number of approximately 1 to approximately 20; in the alkylene, optional —CH2— may be substituted with —O—, —CO—, —COO—, —OCO—, —CH═CH—, —CF═CF— or —C≡C—, and optional hydrogen may be substituted with halogen; Y is a single bond or alkylene having a carbon number of approximately 1 to approximately 20; in the alkylene, optional —CH2— may be substituted with —O—, —CO—, —COO—, —OCO— or —CH═CH—, and optional hydrogen may be substituted with halogen; and m and n are each an integer of approximately 0 to approximately 5, wherein m and n are not 0 at the same time. |
