Synthesis and properties of 3-formyl-4H-pyrans

The Vilsmeier formylation of 4H-pyrans afforded 3-formyl-4H-pyrans. These were converted to 3-formylpyrylium salts, from which pyridine or pyridine salts with an aldehyde group at C₍₃₎ were obtained. The reaction between 3-formyl-4-allyl-4H-pyran and methyltrifluoromethanesulfonate proceeded via a Koop rearrangement.Translated from Khimiya Geterotsiklicheskii Soedinenii, No. 5, pp. 603–607, May, 1990.