Synthesis of Hydrogenated meso-Tetrapyridylporphyrins with a Controlled Composition

The study focuses on the development of a method of synthesis of a photosensitive mixture of controlled composition containing cationic water-soluble 5,10,15,20-tetrakis(N-Me-pyridin-3-yl)chlorin and 5,10,15,20-tetrakis(N-Me-pyridin-3-yl)bacteriochlorin. The diimide reduction of 5,10,15,20-tetrakis(pyridin-3-yl)porphine in pyridine and in the absence of a solvent has been studied. It has been shown that the reduction in the melt significantly decreases the reaction duration (from 12 to 1.5 h) and affords compositions in up to 90% yield.