Patent ID: 6197217
Filing Date: 2001-03-06
Classification: C07C,C09K

Abstract:
A 3,3'-difluorobiphenyl derivative expressed by the general formula (1) ##STR62##wherein Ra and Rb each independently represent a straight chain or branched alkyl group having 1 to 20 carbon atoms in which alkyl group not-adjacent any methylene group (--CH.sub.2 --) may be replaced by oxygen atom, and any hydrogen atom in the alkyl group may be replaced by a halogen atom; A.sub.1, A.sub.2 and A.sub.3 each independently represent trans-1,4-cyclohexylene, dioxane-2,5-diyl, or tetrahydropyran-2,5-diyl, or 1,4-phenylene in which one or more hydrogen atoms may be replaced by fluorine atom; Z.sub.1, Z.sub.2 and Z.sub.3 each independently represent --(CH.sub.2).sub.2 --, --(CH.sub.2).sub.4 --, --CH.sub.2 O--, --(CH.sub.2).sub.3 O-- or single bond; m and n are independently 0 or 1 provided that when both m and n are 0, and A.sub.2 represents 1,4-phenylene, then at least one hydrogen atom on A.sub.2 is replaced by fluorine atom.