Conformational free-energy values for 4-substituents (or 4,4-geminal pairs) in 1-benzylpiperidine benzobromides cannot be derived from the chemical-shift differences between ax- and eq-1-benzyl methylene protons.
R. Brettle, D. R. Brown, J. McKenna and J. M. McKenna, J. Chem. Soc. D, 1969, 696 DOI: 10.1039/C29690000696
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