Hydrogen-1, carbon-13, phosphorus-31 and selenium-77 n.m.r. studies on organophosphorus selenides

Abstract

Hydrogen-1,carbon-13,phosphorus-31 and selenium-77 n.m.r. studies have been carried out on some organophosphine selenides. The n.m.r. studies show that the ditertiary phosphine Ph₂PCH₂PPh₂ reacts with the SeCN- ion to give predominantly the monoselenated derivative Ph₂P(Se)CH₂PPh₂, but with the diphosphine Ph₂P(CH₂)₂PPh₂ the diselenated derivative is obtained. A qualitative study of the solvent dependence of selenium-77 chemical shifts is reported.