Patent ID: 6015508
Filing Date: 2000-01-18
Classification: C07C,C07D,C09K

Abstract:
A liquid crystalline compound of the general formula: ##STR349## wherein X.sub.1 stands for a hydrogen atom, a cyano group, a halogen atom, or an alkyl group with 1-20 carbon atoms, and one or more methylene groups in the alkyl group may be replaced by --CH.tbd.CH--, --C.tbd.C--, or oxygen atoms and one or more hydrogen atoms may be substituted by halogen atoms;X.sub.2 stands for a hydrogen atom, an alkyl group with 1-10 carbon atoms, or a substituent of --(A.sub.5 --Z.sub.4).sub.s --A.sub.6 --X.sub.3 ; l, m, n and s each stands for an integer of 0 or 1, p, stands for an integer of 0-5; X.sub.3 for an alkyl group with 1-10 carbon atoms; Z.sub.1 -Z.sub.4 each independently stands for a covalent bond or an alkylene group with 1-5 carbon atoms, and one or more methylene groups in the alkylene group may be replaced by --CH.dbd.CH--, --C.tbd.C--, or an oxygen atom and one or more hydrogen atoms in the alkylene group may be substituted by halogen atoms; the rings A.sub.1 -A.sub.6 each independently stands for a 1,4-phenylene, a 1,4-cyclohexenylene, or a trans-1,4-cyclohexylene, and the carbon atoms in the ring may be replaced by nitrogen atoms or oxygen atoms and the hydrogen atoms in the ring may be substituted by halogen atoms or cyano groups; and B.sub.1 and B.sub.2 each independently stands for --CH.dbd.CH-- or --C.tbd.C--, with the proviso that both of B.sub.1 and B.sub.2 should not be --CH.dbd.CH-- at the same time.