Patent ID: 7087787
Filing Date: 2006-08-08
Classification: C07C,C07D

Abstract:
1. A process for the preparation of compounds of the formula (I): in which: Ar is an optionally substituted aromatic ring system having 4 to 20 carbon atoms, X is a leaving group, R p denotes para with respect to the two methylene radicals on both sides of Ar, the process comprising the following steps: a) reacting a compound of the formula (II):  in which Ar and X are as defined under the formula (I), with an organic sulfide of the formula (III):  in which: to give a compound of the formula (IV):  in which R b) reacting the compound of the formula (IV) with from 0.85 to 1.1 equivalents of a mercaptan of the formula (V):  in which: c) warming of the compound of the formula (VI) in a liquid and formation of the compound of the formula (VII):  by elimination of the organic sulfide of the formula (III), where the compound of the formula (VII) is dissolved in the above liquid, d) oxidizing the compound of the formula (VII) with an oxidant, to give the compound of the formula (I).