A 13 C and 31 P magnetic double resonance study of organo-phosphorus compounds

Abstract

Twenty-two organo-phosphorus compounds of a variety of structural types have been examined by 1 H—{ 13 C} and 1 H—{ 31 P} magnetic double resonance spectroscopy. The signs and magnitudes of the 31 P—H and 31 P— 13 C spin-spin coupling constants are sensitive to the valency of the phosphorus atom, and the nature of the groups attached to it. Parallel behaviour is noted between two types of coupling constant. The 31 P chemical shifts agree with results obtained by conventional 31 P single resonance spectroscopy, and the 13 C chemical shifts depend on the polarizability of the phosphorus atom and its associated groups.