Double chemical shift nonequivalence of the methyl groups in the n.m.r. spectra of the title compounds at –100° indicates a considerable barrier to rotation around the P–N bond; ΔG‡= 9·9 and 9·4 kcal/mole for the sulphide and oxide, respectively.
W. B. Jennings, J. Chem. Soc. D, 1971, 867 DOI: 10.1039/C29710000867
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