ELECTROREDUCTION OF ALPHA AND BETA-MESO-NITRODEUTEROPORPHYRINS IN A FLOW CELL - PREPARATION OF MESO-AMINODEUTEROPORPHYRINS AND MESO-HYDROXYLAMINODEUTEROPORPHYRINS

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 th e time scale of cyclic voltammetry, hydroxylamino and nitroso derivati ves can be observed. The electrosyntheses of alpha and beta meso-hydro xylaminodeuteroporphyrins (IIa and b) and alpha and beta meso-aminodeu teroporphyrins (IIIa and b) are carried out in a flow cell with a poro us cathode. Disproportionation of hydroxylamino derivatives occurs in acid medium and limits the yield. The electrosynthesis of alpha and be ta meso-nitrosodeuteroporphyrins in a ''redox'' cell with two consecut ive porous electrodes of opposite polarities failed.