Thiapyrylium and pyrylium salts with furyl substituents

The possibility of obtaining pyrylium and thipyrylium salts that contain acidophobic furyl substituents by the action of protic acids on the corresponding 1,5-diketones in acetic acid or methanol, depending on the position of the furan rings relative to the carbonyl groups, was established.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1604–1607, December, 1981.