PROCESS FOR PREPARING 3-DIHALOMETHYLPYRAZOLE-4-CARBOXYLIC ACID DERIVATIVES

摘要

The invention relates to a process for preparing 3-dihalomethylpyrazole-4-carboxylic acid derivatives of the formula (I) by reacting .alpha.-fluoroamines of the formula (III) in the presence of Lewis acids with acrylic acid derivatives of the formula (II) to give vinamidinium salts of the formula (IV) and the subsequent reaction thereof with hydrazines, and to the vinamidinium salts of the formula (IV) themselves: (see formula I) (see formula II) (see formula III) (see formula IV)