There are three types of photochromic processes for substituted quinones. They are characterized by photoinduced isomerization of the colorless or yellow para-quinone form to the ana-quinone colored form. Photochemical hydrogen and acyl migration in photochromic 1-alkyl- and 1-acylanthraquinones is the adiabatic process occurring on the triplet potential energy surface. Quantum chemical calculations of the structure of triplet intermediates in the photochromic reactions of phenoxy quinones were performed. It was concluded, that the most preferable mechanism of photochemical phenyl migration is the non-adiabatic process with the formation of the triplet biradical spiro-form. Variation of the lifetime of photoinduced ana-quinones by the orders of magnitude was achieved by the modification of quinone structures.