Terminal difluoromethylenes were prepared by two different routes:(a) by treating ketones and aldehydes with bis (methylthio) methane, producing 2-alkyl-1, 1-bis (methylthio) alkene (2)(b) reacting alkyl halides with tris (methylthio) methane forming 1-alkyl-1, 1, 1-tris (methylthio) alkane derivatives (7). The reaction of either 2 or 7 with BrF3, followed by oxidation with HOF· CH3CN gave the difluorosulfonyl derivatives 4. Consecutive treatment ...
