C. Uncuta et al., Reactions of pyrylium salts with nucleophiles. Part 26. The reaction with the cyanide anion revisited, J CHEM R-S, (5), 2001, pp. 170-171
Reaction mechanisms are provided for the formation of diastereomeric 2,4-di
alkyl-6-oxo-2,4-heptadienonitriles (including minor diastereoisomers observ
ed for the first time) from 2,4,6-trialkylpyrylium salts and aqueous sodium
cyanide.