Synthesis of N-(perfluoro-t-butyl)pyrazoles from hexafluoroacetone azine by trifluoromethyl group migration

Abstract
The synthesis of 1-(nonafluoro-t-butyl)-3-trifluoromethylpyrazoles (3) from hexafluoroacetone azine (1) and alkoxyacetylenes is described; the reaction involves an azomethine imide intermediate which rearranges by apparent [1,4] migration of a trifluoromethyl group.

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