Patent ID: 6576303
Filing Date: 2003-06-10
Classification: C09K

Abstract:
A liquid crystalline compound expressed by the general formula (1):R1â€”A1â€”B1â€”A2â€”B2â€”A3â€”B3â€”Zâ€”B4â€”A4â€”R2â€ƒâ€ƒ(1) wherein A1, A2, A3 and A4 each independently represent a single bond, 1,4-cyclohexylene, 1,4-phenylene which may be substituted with a fluorine atom(s), dioxane-2,5-diyl, pyrimidine-2,5-diyl, piperidine-1,4-diyl, pyridine-2,5-diyl which may be substituted with a fluorine atom(s) or 1-sila-1,4-cyclohexyllene; Z represents a group selected from divalent groups expressed by partial structural formulas (I) to (VI): wherein X represents a hydrogen atom or a fluorine atom, and Y represents a difluoromethyl group, a difluoromethoxy group, a formyl group or a carboxyl group; B1, B2, B3 and B4 each independently represent a single bond, 1,2-ethylene, 1,2-ethenylene, -1,2-ethynylene, oxymethylene, methyleneoxy, carbonyloxy, oxycarbonyl or 1,4-butylene group, provided that when Z is a group represented by the partial structural formula (III), then B4 is neither oxymethylene nor oxycarbonyl group, and that when Z is a group represented by the partial structural formula (IV), then B3 is neither methyleneoxy nor carbonyloxy group, and that when Z is a group represented by the partial structural formula (I), (II), (III) or (IV), then A1, A2, A3 and A4 do not simultaneously represent a single bond, and that when Z is a group represented by the partial structural formula (V) or (VI), then Y does not represent a carboxyl group; R1 and R2 each independently represent an alkyl group or a fluoroalkyl group substituted with at least one fluorine atom having 1 to 10 carbon atoms in which alkyl group or fluoroalkyl group one or not adjacent two or more methylene groups may be replaced by an oxygen atom, a sulfur atom or â€”CH&boxH;CHâ€”.