Reactions of pyrylium salts with nucleophilic agents

The reaction of -unsubstituted pyrylium salts with alkali-metal cyanides gives cyano- and carboxy-substituted pyrans and pyrylium salts, while the reaction with sodium sulfide gives dipyranyl sulfides. A phthalimide derivative of pyran is obtained from 2,6-diphenylpyrylium perchlorate and potassium phthalimide, while pyrylium cations react with zinc to give the corresponding dipyranyls.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1313–1316, October, 1972.