Direct measurements at 183 K of the con-formers of cis-4-methylcyclohexylphosphine and its P-dimethyl and P-dichloro derivatives by 31P n.m.r. spectroscopy, and comparison of the averaged 31P shifts at 300 K with the shifts for t-butylcyclohexyl compounds, have been used to determine the first conformational free energies for phosphorus functions.
M. D. Gordon and L. D. Quin, J. Chem. Soc., Chem. Commun., 1975, 35 DOI: 10.1039/C39750000035
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