The dimerisation of 5-methylene-Δ2-1,3,4-oxadiazolines

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Abstract
The stable anhydro-bases, 5-p-nitrobenzylidene- and 5-benzylidene-2,4-diphenyl-Δ2-1,3,4-oxadiazoline have been prepared from the corresponding oxadiazolium perchlorates. The benzylidene derivative dimerises in the presence of acyl chlorides. Treatment of six 2-alkyl-1,3,4-oxadiazolium salts with triethylamine gave analogous dimers which are shown to be 3-(ββ-diacylhydrazino)pyrazoles.

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