IMINIUM

The general structure of an iminium cation

An 'iminium' salt or cation in organic chemistry has the general structure [R¹R²C=NR³R⁴]⁺ and is as such a protonated or substituted imine ^[1]. It is an intermediate in many organic reactions such as the Beckmann rearrangement, Vilsmeier-Haack reaction, Stephen reaction or the Duff reaction. The use of the alternative names 'imonium' compounds and 'immonium' compounds is discouraged.

Reactions involving iminium salts

'Iminylium ions' have the general structure R₂C=N⁺. Nitrenium ions form a subclass ^[2].

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