METHOD FOR PRODUCING 1 SUBSTITUTED 5-CHLORO-4 METHYL PYRAZOLES

摘要

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.