Trifluoroacetylation of Furan Compounds.

1. Furan, 2-alkylfurans, and 1,1-di(fur-2-yl)alkanes react with trifluoroacetic anhydride to giveα-trifluoroacetyl derivatives of furan. 2. In the case of 2,5-dimethylfuran, the trifluoroacetylation proceeds at the exposition of the furan ring and the methyl group to form a substituted 2,5-dihydrofuran.