[en] Using the method of pulsed photolysis Re(7) photoreduction in the presence of electron donors-diphenylamine (DPA) and hydroquinone (HQ) in concentrated HCl solutions is studied. A short-lived rhenium (6) complex ReOCl₅^- appeared in photolysis eneters in reaction of single-electron oxidation of both DPA with DPA⁺ radical-cation formation and HQ with semiquinone radical formation. DPA⁺ radical-cations disappear in in the second-order reaction with stable product formation (λ_max=590 nm)