Study of the reactivities of methyl esters of furan-2-carboxylic and thiophene-2-carboxylic acids by the method of competitive nitration

The reactivities of methyl esters of furan-2-carboxylic and thiophene-2-carboxylic acidswere studied by the method of competitive nitration. Methyl furan-2-carboxylate is more active in its reactions with a mixture of nitric acid and acetic anhydride (with sulfuric acid as the catalyst) and with a mixture of nitric and sulfuric acids (with acetic anhydride as the solvent).Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 601–604, May, 1978.