Polarograms of a mixture of alpha and beta meso-nitrodeuteroporphyrins (Ia and b) in methanol containing sulphuric acid, show several waves corresponding to the reduction of nitrogroup and porphyrin ring. On the time scale of cyclic voltammetry, hydroxylamino and nitroso derivatives can be observed. The electrosyntheses of alpha and beta meso-hydroxylaminodeuteroporphyrins (IIa and b) and alpha and beta meso-aminodeuteroporphyrins (IIIa and b) are carried out in a flow cell with a porous cathode. Disproportionation of hydroxylamino derivatives occurs in acid medium and limits the yield. The electrosynthesis of alpha and beta meso-nitrosodeuteroporphyrins in a "redox" cell with two consecutive porous electrodes of opposite polarities failed.