Patent ID: 6392081
Filing Date: 2002-05-21
Classification: C07C,C07D

Abstract:
A process for the preparation of a compound of formula (I): wherein W represents CR3;R1 represents halogen, haloalkyl, haloalkoxy, R4S(O)nâ€”, or â€”SF5; R2 represents hydrogen or halogen; R3 represents halogen; R4 represents alkyl or haloalkyl; and n represents 0, 1 or 2; which process comprises: (A) reacting a compound of formula (II): â€ƒwherein R5 and R6 independently represent alkyl or together represent an alkylene chain having two or three carbon atoms, with an acid addition salt of an arylhydrazine compound of formula (III): â€ƒwherein R1, R2 and W are as hereinbefore defined; or (B) reacting a compound of formula (IV): â€ƒwherein R7 represents alkyl, with an acid addition salt of an aryl hydrazine compound of formula (III), wherein R1, R2 and W are as hereinbefore defined; or (C) oxidizing a compound of formula (V): â€ƒwherein R1, R2 and W are as hereinbefore defined with an oxidant.