Determination of conformational free energies for phosphorus functions by 31P nuclear magnetic resonance spectroscopy
Abstract
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.