The n.m.r. spectrum of the CH3 and CD2H groups in (3) and (4) respectively is temperature-dependent, indicating that the barrier to rotation of the methyl group is 7·2 kcal mol–1 at –131°.
J. E. Anderson and D. I. Rawson, J. Chem. Soc., Chem. Commun., 1973, 830 DOI: 10.1039/C39730000830
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