Polyvalent porphyrins. 1. Properties of tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin (1-P) and its iron(III) and zinc(II) derivatives

Abstract

The peroxidases react with hydrogen peroxide to cleave the 0-0 bond and produce a protohemin derivative that is 2e~e quiv more oxidized than the resting Fe(III) porphyrin.2 3•3 Recent evidence suggests that at least one of the electrons is removed from the porphyrin system to give a cation radical that is responsible for much of the electron transfer involved in substrate oxidations.4•5

Organotins‐promoted peroxidation of unsaturated fatty acids: A new antioxidative scavenger for promoters

“…The free base porphyrins meso-tetraphenylporphyrin and meso-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin were synthesized as described previously by the known procedures [25][26][27][28], purified by silica gel column chromatography using CHCl 3 , 80% CHCl 3 , and 20% hexane as the eluting solvents and identified by UV-Vis and IR spectroscopy. UVVis spectra were recorded on a Varian 100S spectrophotometer in CH 2 Cl 2 , benzene, CHCl 3 , and oleic acid.…”

EPR study of a novel [Fe–porphyrin] catalyst

“…The porphyrin A, see Scheme 1, was synthesized by known procedures as described previously [26,27] and purified by silica gel column chromatography using CHCl 3 , 80 % CHCl 3 and 20 % hexane as the eluting solvents.…”

Control over the Optical and Morphological Properties of UV-Deposited Porphyrin Structures

“…[32][33][34] The presence of a marked broadening and red shift of the Soret bands, accompanied by enhanced and red-shifted Q-bands, has been ascribed to charge-transfer processes either into or out of the porphyrin ring. 33,34 According to this hypothesis, the extra orbitals providing the charge-transfer level belong to the coordinated metal ion or, as in our case, to suitably conjugated substituents.…”