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The formylation of electron-rich aromatic compounds with a mixture of dimethylformamide and phosphorus oxychloride POCl3 is commonly referred to as the Vilsmeier reaction, or sometimes the Vilsmeier-Haack reaction, from the names of the two German chemists who first described it in 1927.
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The Sandmeyer reaction is an organic substitution type reaction used for the synthesis of aryl halide from an aryl diazonium salt. the catalyst used in Sandmeyer reaction is a copper(I) halide like chloride, bromide or iodide ions catalyst. significantly, The reaction include trifluoromethylation, hydroxylation, cyanation, and halogenation type reaction on benzene.
The most well-known use of the Strecker reaction, α-amino nitriles, is their hydrolysis under acidic or basic conditions to obtain α-amino acids (Strecker amino acid synthesis).
The Perkin reaction (or Perkin condensation) is an condensation of aromatic aldehydes and the anhydrides of aliphatic carboxylic acids in the presence of a weak base to obtain α,β-unsaturated carboxylic acids
