Abstract
AbstractNitrilium salts 2 add oximes 1 to form stable alkylideneaminooxy‐substituted iminium salts 4. Compounds 4 have been postulated by Meerwein as intermediates of the Beckmann rearrangement of oximes[1]. For (E)‐4c an X‐ray structural analysis is performed. Other intermediates of the Beckmann rearrangement are the N‐acylamidinium salts 5, which are produced by the reaction of nitrilium salts with amides. As models for the transformation of 5 into amides, the end products of the Beckmann rearrangement, reactions of N‐acylamidinium salts with nucleophiles, e.g. oximes, alcohols, water, amines, thiols, and benzophenone imine are studied.
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