Bromination of Tetraazaporphine and Its #beta#-Substituted Derivatives Using Pyridine as Solvent and Catalyst

摘要

The selectivity and degree of bromination of pyrrole rings in porphyrazine strongly depends on the bromination agent and solvent nature. The reaction of porphyrazine magnesium complex with molecular bromine and N-bromosuccinimide in pyridine gave magnesium complex of dibromotetraazaporphine. Increasing bromine substitution in porphyrazine enhances its acidic properties.