Étard reaction
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The Étard reaction is a chemical reaction that involves the direct oxidation of an aromatic or heterocyclic bound methyl group to an aldehyde using chromyl chloride.<ref>(a) Étard, A. L. Compt. Rend. 1880, 90, 534. (b) Étard, A. L. Ann. Chim. Phys. 1881, 22, 218.</ref><ref>Hartford, W. H.; Darrin, M. Chem. Rev. 1958, 58, 1. (Review)</ref> For example, toluene can be oxidised to benzaldehyde:
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