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Vilsmeier-Haack reaction
The Vilsmeier-Haack reaction (also called the Vilsmeier reaction) is the chemical reaction of a substituted amide (1) with phosphorus oxychloride and an activated arene (3) to produce an aryl aldehyde or ketone (5). The reaction of a substituted amide with phosphorus oxychloride gives a substituted chloroiminium ion (2), also called the Vilsmeier reagent.
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