Patent ID: 6231785
Filing Date: 2001-05-15
Classification: C09K

Abstract:
A method for producing a benzene derivative represented by the formula (3) according to Scheme 1, where R.sub.1 represents hydrogen or alkyl having 1 to 15 carbons, one or more methylene groups in the alkyl which are not adjacent to each other may be replaced by oxygen, sulfur or --CH.dbd.CH--, and any hydrogen in the alkyl may be replaced by fluorine; A.sub.1, A.sub.2 and A.sub.3 each independently represent trans-1,4-cyclohexylene in which one or more methylene groups constituting the ring may be replaced by oxygen or sulfur, or 1,4-phenylene in which one or more hydrogens on the ring may be replaced by fluorine; Z.sub.1, Z.sub.2 and Z.sub.3 each independently represent a single bond, --CH.sub.2 CH.sub.2 --, --(CH.sub.2).sub.4 --, --CH.sub.2 O-- or --OCH.sub.2 --; l, m and n each independently represent 0 or 1; and Y.sub.1 represents chlorine, bromine or iodine, ##STR495##which method comprises treating a benzene derivative represented by the formula (1), where R.sub.1, A.sub.1, A.sub.2, A.sub.3, Z.sub.1, Z.sub.2, Z.sub.3, l, m and n have the same meanings as above; and X represents hydrogen, chlorine, bromine or iodine, with a base to produce a carbanion, and reacting the formed carbanion with a difluoromethane derivative represented by the formula (2), where Y.sub.1 and Y.sub.2 each independently represent chlorine, bromine or iodine.