Pyrylium Salts Part I. Syntheses

摘要: Publisher Summary The pyrylium salts represent one of the fundamental heterocyclic systems and are basis important natural products such as anthoeyanins. This chapter reviews scope, nomenclature, formulation, syntheses salts. classified into three groups, according to number building blocks required form ring in a one-step process. groups are: (1) one-component syntheses, (2) two-component (3) three-component syntheses. Pyrylium bearing aromatic or substituents, possessing fused saturated rings considered monocyclic discussed. A reactions starting from involving substitution at ring, modification existing substituents also described. useful intermediates conversion aliphatic materials carbocyclic compounds. Some practical applications emerged fluorescent dyes, photosensitizers for silver halides, photographic emulsions.