An iminium salt or ion in organic chemistry has the general structure R₁-CH=NH⁺-R₂ and is as such a protonated imine. It is an intermediate in many organic reactions such as the Beckmann rearrangement, the Vilsmeier-Haack reaction or the Duff reaction. The use of the alternative names imonium compounds and immonium compounds is discouraged. In chemistry, salt is a term used for ionic compounds composed of positively charged cations and negatively charged anions, so that the product is neutral and without a net charge. ... An ion is an atom or group of atoms with a net electric charge. ... Organic chemistry is the scientific study of the structure, properties, composition, reactions, and synthesis of organic compounds that by definition contain carbon. ... Protonation is the addition of a proton (H+) to an atom, molecule, or ion. ... An imine is a functional group or chemical compound containing a carbon-nitrogen double bond. ... Organic reactions are chemical reactions between organic compounds. ... In chemistry, the Beckmann rearrangement is the rearrangement of a ketoxime to the corresponding amide in concentrated sulfuric acid, phosphorus pentachloride or a few other catalysts. ... The Vilsmeier-Haack reaction or Vilsmeier reaction is an organic reaction between a substituted amide and a activated arene in the presence of phosphorus oxychloride. ...

External links

• IUPAC goldbook definition