Method for producing 1 substituted 5-chloro-4 methyl pyrazoles

Details Method for producing 1 substituted 5-chloro-4 methyl pyrazoles Method for producing 1 substituted 5-chloro-4 methyl pyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/16 (2006.01) C07D 231/14 (2006.01) C07D 231/20 (2006.01) C07D 231/22 (2006.01)

Patent

CA 2423605

The invention relates to a method for producing 1-substituted 5-chloro-4- methyl pyrazoles of general formula (I) wherein R has the designated cited in claim 1. Said method reacts 4-methyl pyrazole of general formula (II) with chlorine, separating the mixture obtained from mono and dichlorinated products, by means of distillation subsequently dehalogenizing the dichlorinated compound to obtain compound II and re-introduction into the reaction with chlorine.

Procédé de production de 5-chlore-4-méthylpyrazoles substitués en position 1 de formule générale (I) dans laquelle R possède la signification figurant dans la revendication 1. Ledit procédé consiste à mettre en réaction un 4-méthylpyrazole de formule générale (II) avec du chlore, à séparer par distillation le mélange obtenu en produit monochloré et en produit dichloré, à déshalogéner le composé dichloré pour obtenir le composé (II) et à réintroduire ce dernier dans la mise en réaction avec du chlore.

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