Preparation and nuclear magnetic resonance spectra of symmetrical spin systems containing phosphorus: bis(fluorophosphinothioyl) sulphides

Abstract

The reaction of phenyltetrafluorophosphoranes with cyclodiphospha(V)thianes affords a convenient route to bis(fluorophosphinothioyl) sulphides, [RFP(:S)]₂S. Proton, ¹⁹F, and ³¹P n.m.r. spectra were recorded for the compounds with R = Me, Et, and Ph, each of which exists as a mixture of (±)- and meso-forms. The analysis of the spectra of these symmetrical spin systems is discussed. Heteronuclear double-resonance assisted the spectral analyses greatly. The coupling constants, including many signs, are reported and discussed. The values of J_PF, J_PP, and J_FF are appreciably different for the two stereoisomers of a given compound.