In the acetylation of 2,3-dimethylbenzofuran (I) by Ac2O and SnCl4 in 1,2-dichloroethane, besides the main product of the reaction, 6-acetyl-2,3-dimethyl-benzofuran (IV), 2-acetyl-3-ethylbenzofuran (II) is also obtained in 9% yield, probably via attack of the electrophile at the 2-position of (I) and subsequent rearrangement of the 2-methyl group.
E. Baciocchi, A. Cipiciani, S. Clementi and G. V. Sebastiani, J. Chem. Soc., Chem. Commun., 1978, 597 DOI: 10.1039/C39780000597
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