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A. T. Balaban, A. Dinculescu, G. N. Dorofeeko, G. W. Fischer, A. V. Koblik, V. V. Metzheritskii and W. Schroth, Pyrylium Salts. Synthesis. Reactions and Physical Properties, in Adv. Heterocycl. Chem.. Suppl 2, 1982. 

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Among the numerous classes of heterocyclic cations that are now actively studied, pyrylium salts are distinguished by the extraordinary variety of their transformations, making them good synthons and widely applicable. An exhaustive review on this subject has been published by an international group of chemists dealing with pyrylium chemistry [82AHC(Suppl.)]. 

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