METHOD FOR PREPARING 1-ALKYL-3-DIFLUOROMETHYL-5-FLUOR-1H-PYRAZOLE -4-CARBALDEHYDES AND 1-ALKYL-3-DIFLUOROMETHYL-5-FLUOR-1H-PYRAZOLE -4-CARBOXYLATES.

摘要

The present invention relates to a novel method for preparing 1-alkyl-3-difluoromethyl-5-fluor-1H-pyrazole-4-carbaldehydes or esters thereof of formula (I) by means of reductive dehalogenation, starting from 1-alkyl-3-chlorodifluoromethyl-5-fluoro-1H-pyrazole-4-carbaldeh ydes or esters thereof Formula (I).