Abstract
In the photochemical reactions of triplets of both protoporphyrin-IX-dimethyl-ester (PP) and haematoporphyrin dihydrochloride (HP) with α-phenyl-ethyl hydroperoxide (HROOH) in C 6H 6 at room temperature, both OO and CC bonds are broken yielding alkoxy and carbon-centred radicals. The ruptures of CC and OH bonds were observed in the photochemical reaction of PP with tert-butanol in the same solvent, yielding alkoxy and carbon-centred radicals at λ⩾ 366 nm, while HP did not react photochemically with tert-butanol at λ⩾334 nm.
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