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 JPF, JPP, and JFF are appreciably different for the two stereoisomers of a given compound.