A procedure for the preparation of the compound 1,2-alfametilen-6,7-alpha-difluormethylen-20-espirox-4-en-3-ona. (Machine-translation by Google Translate, not legally binding)

摘要

A process for the preparation of the compound 1,2-α -methylene-6,7- α -difluoromethylene-20-spirox-4-en-3-one, which consists of reacting the compound 1,2- α -methylene-20-spiroxa-4-, 6-dien-3-one A) with trimethyltrifluoromethyl tin; or B) with an alcohol to produce a ketal at position 3 and then reacting the latter compound with sodium chlorodifluoroacetate; or C) with metachloroperbenzoic acid to produce the 6,7- β -epoxy derivative and then reacting the latter compound with difluoromethylene triphenylphosphorane; and isolating the desired product thus obtained. (Machine-translation by Google Translate, not legally binding)