Beiträge zur Chemie des Phosphors. 237. Reaktion von Diphosphan(4) mit Peroxoverbindungen: Bildung von Phosphinophosphinsäure,H2PPH(O)OH,und Bis(phosphino)phosphinsäure, (H2P)2P(O)OH

Contributions to the Chemistry of Phosphorus. 237. On the Reaction of Diphosphane(4) with Peroxo Compounds: Formation of Phosphinophosphinic Acid, H₂PPH(O)OH, and Bis(phosphino)phosphinic Acid, (H₂P)₂P(O)OH Diphosphane(4) reacts with peroxo compounds such as hydrogen peroxide, tetraline hydroperoxide, trifluoroperoxyacetic acid, and cumene hydroperoxide (which is particularly suited for preparative work) at ?30°C to furnish phosphino-phosphinic acid, H₂PPH(O)OH ( 1 ), as the primary product. Compound 1 disproportionates to a major extent in statu nascendi to give phosphanes (above all PH₃) and monophosphorus acids of various oxidation states as well as some bis(phosphino)phosphinic acid, (H₂P)₂P(O)OH ( 2 ). The acids 1 and 2 can be trapped and stabilized as their triethylammonium salts. The structures of these salts have been determined by spectroscopic investigations.