Formylation reaction

A Formylation reaction in organic chemistry is the catch-all name for any organic reaction in which an organic compound is functionalized with a formyl group -CH=O.

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Aromatic formylations exist with:

• dimethylformamide and phosphorus oxychloride in the Vilsmeier-Haack reaction
• hexamine in the Duff reaction
• carbon monoxide and hydrochloric acid in the Gattermann-Koch reaction
• zinc cyanide and hydrochloric acid in the Gatterman Aldehyde Synthesis
• chloroform in the Reimer-Tiemann reaction

These reactions are all electrophilic aromatic substitutions