The sterically protected and electronically activated metalloporphyrins find myriad applications from drug metabolism, valorization of biomass, production of fine chemicals and environmental remediation. We report herein an entirely recent activity and potential utility in flame retardancy of polyurethanes. Catalytic oxidation by aza-macrocycles was investigated by us for  potential use as flame retardants in polymers. Substituted tetraphenyl porphyrins with transition metal canters were used in polyurethane systems to catalyze the formation of a protective layer of char to attenuate and improve flame retardancy. The comparative analysis of increased catalytic activity of various substituted tetraphenyl porphyrins was another key component of this work. We have also explored other diversely substituted azamacrocycles such as Vitamin B12 and Chlorophyll and have drawn correlations between activity and composition of the core

Magical metalloporphyrins: Mirror, mirror on the wall; which is the best porphyrin of them all?

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