Die Reaktion von Tri-t-butylphosphan und Tri-t-butylarsan mit Selen und Tellur: Bildung inerter und labiler Chalkogenophosphorane und -arsorane / The Reaction of Tri-t-butylphosphane and Tri-t-butylarsane with Selenium and Tellurium: Formation of Inert and Labile Chalcogenophosphoranes and -arsoranes

Abstract

The reactions of tri-t-butylphosphane 1 with selenium and tellurium proceed quantitatively with formation of seleno- and the telluro-tri-t-butylphosphorane. respectively (3, 4). Tri-t-butylarsane 2 reacts with selenium to give seleno-tri-t-butylarsorane (5), but no significant interaction is observed between 2 and elemental tellurium. 1 H and 31 P NMR spectra provide evidence for rapid tellurium transfer between telluro-tri-t-butylphosphorane (4) and tri-t-butylphosphane (1), tri-t-butylarsane (2) or tris(dimethylamino)phosphane. Selenium transfer between seleno-tri-t-butylarsorane (5) and tri-t-butylarsane (2) leads to 1 H and 13 C NMR line broadening. Vibrational spectra of t-Bu 3 E−Y (3: E = P, Y = Se; 4: E = P, Y = Te; 5: E = As, X = Se) indicate coupling of E−C and E−Y stretching vibrations in 3 and 4.