Nuclear magnetic resonance spectra of symmetrical phosphorus compounds. Part V. 1H nuclear magnetic resonance spectrum of P,P′-dimethyl-P,P′-di-t-butyldiphosphine P,P′-disulphide, an [ARtXn]2 spin system

Abstract

General expressions are given for the X transition frequencies and intensities of the [AR_tX_n]₂ spin system with J_RR^′=J_XX^′=J_RX^′=J_RX^′= 0. The information is used for the analysis of the ¹H n.m.r. spectrum of [Me(Bu^t)P-(S)]₂. The value of ¹J_PP(118 ± 5 Hz) for this molecule is found to be unusually high for a tetra-alkyldiphosphine disulphide.