1. The reaction of hexafluoroacetone oxime with diazomethane gives the O-methyl derivative, reaction with carbamoyl chlorides and chlorocarbonic esters gives the carbamoyl and alkoxycarbonyl derivatives, while reaction with phosgene and thionyl chloride gives the carbonate and thionyl derivatives of the oxime. 2. Hexafluoroacetone oxime tosylate when treated with dimethylamine is cleaved to hexafluoroacetone dimethylhydrazone, while the corresponding urethylanes are formed when hexafluoroacetone methoxycarbony oxime is reacted with ammonia and dimethylamine.