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The photooxidation of protoporphyrin -IX dimethyl ester by singlet molecular oxygen in various solvents was studied. It was shown that dielectric effect of a solvent is important in determining of the rate constant of this process. Keywords: Protoporphyrin -IX d.m.e., photooxidation, dielectric effect of a solvent. Figure 1. Structural formulae of protoporphyrin -IX dimethyl ester (I) and hydroxyaldehydes (II and III).doi:10.6060/mhc2009.2.172 fatcat:brgskt5hand3hj3emb26wnkday