Iminium

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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 . 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

• Beckmann rearrangement
• Eschenmoser's salt
• Duff reaction
• Stephen reaction
• Vilsmeier-Haack reaction

Iminylium ions

Iminylium ions have the general structure R₂C=N⁺. Nitrenium ions form a subclass .