Process for the preparation of phenyl pyrazole compounds

Details Process for the preparation of phenyl pyrazole compounds Process for the preparation of phenyl pyrazole compounds

C - Chemistry, Metallurgy

07

C

C07C 323/60 (2006.01) C07C 319/14 (2006.01) C07D 231/44 (2006.01)

Patent

CA 2490987

Disclosed is a process for the preparation of a compound of general formula (III), which comprises the reaction between a compound of general formula (V) and dicyano acetylene (IV), said reaction carried out in the presence of water (see formula IV) (see formula V) (see formula III) wherein R is selected from the group consisting of CF3, and C1 to C6 alkyl; and M is an alkaline or alkaline-earth metal or silver. The compound of general formula (III) may be used in the synthesis of pesticidally active compounds such as fipronil.

Cette invention a trait à la production d'un composé, correspondant à la formule (III), produit de la réaction entre un composé correspondant à la formule générale (V) et du dicyano-acétylène correspondant à la formule (IV), cette réaction se faisant en présence d'eau. Dans ces formules, R est choisi entre CF¿3? et un alkyle ayant de 1 à 6 atomes de carbone et M représente un métal alcalin ou un métal alcalino-terreux ou un argent.

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