Patent ID: 6333080
Filing Date: 2001-12-25
Classification: C07C,C07D,C09K

Abstract:
A liquid crystalline alkenyltolan derivative expressed by the general formula (1)C.sub.t H.sub.2t-1 --G--(CH.sub.2).sub.m --A.sub.1 --B.sub.1 --(A.sub.2 --B.sub.2).sub.n --(A.sub.3 --B.sub.3).sub.p --A.sub.4 --X (1)wherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent a 1,4-cyclohexylene, 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s), dioxane-2,5-diyl, or pyrimidine-2,5-diyl group; B.sub.1, B.sub.2, and B.sub.3 independently represent a covalent bond, an 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene, oxymethylene, methylenoxy or carbonyloxy provided that at least one of B.sub.1, B.sub.2, and B.sub.3 represents an 1,2-ethynylene group; G represents a covalent bond or an oxygen atom; C.sub.t H.sub.2t-1 represents an alkenyl group having t carbon atoms wherein t is an integer of 2 to 10; m is an integer of 0 to 2; n and p are independently an integer of 0 or 1; X represents an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, a chlorine atom, a bromine atom, or a cyano group wherein one or more methylene groups or fluoromethylene groups in the alkyl group or the fluoroalkyl group may be replaced by an oxygen atom(s) or an 1,2-ethenylene group, but adjacent two methylene groups should not be simultaneously replaced by them; provided that when A.sub.4 represents 1,4-phenylene group which is not substituted with a fluorine atom(s), there is no case that G represents a covalent bond and t+m=3 simultaneously; provided that when A.sub.1 represents 1,4-phenylene group which is not substituted with a fluorine atom(s), B.sub.1 represents 1,2-ethynylene, and G represents a covalent bond, there is no case that t+m=3; provided that when A.sub.1 represents a 1,4-phenylene group wherein fluorine atoms replace two hydrogens and A.sub.4 represents a 1,4-cyclohexane, B.sub.1 is not a triple covalent bond; and each element in the molecule may be its isotope.