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The low-temperature  19 F NMR spectrum of the stereochemically non-rigid compound, CH 3 SPF 4 , shows three fluorine environments, one for the equatorial and two for the nonequivalent axial fluorine atoms. Each of the twelve lines of the upfield  19 F- (axial) resonance shows further fine structure, due to coupling between  19 F and the protons of the CH 3 S group. The center peaks of the two multiplet components reveal apparent quintet structure which, based on a computer simulation of the  19 F spectrum of CH 3 SPF 4 , is rationalized in terms of accidental overlap of two quartets.

Notizen: The Fluorine-19 NMR Spectrum of Methylthiotetrafluorophosphorane