Two series of chlorin p6 13,15-cycloimides that differ in their substituents at the nitrogen atom of the additional six-membered ring were synthesized. The compounds of the first series have a hydroxyl, alkoxyl, or acyloxy group at the 13,15-cycloimide nitrogen and those of the second series, residues of aliphatic alcohols. The cycloimides synthesized are satisfactorily stable and display an intensive light absorption maximum at 710-718 nm. Treatment of the cycloimides with sodium periodate in the presence of osmium tetroxide and with the Vilsmeier reagent resulted in the formation of 3-formyl- and 3-(2-formylvinyl)derivatives, respectively. The conversion of vinyl into formyl group or 2-formylvinyl group leads to an additional bathochromic shift of the long-wave maximum by 30 nm on an average. An extra hydroxy group was introduced at position 18 of the macrocycle to increase the cycloimide hydrophilicity. The English version of the paper: Russian Journal of Bioorganic Chemistry, 2004, vol. 30, no. 5; see also http: // www.maik.ru.

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