A combination of lineshape analysis and magnetisation transfer experiments in variable temperature 13C cross-polarisation magic-angle-spinning n.m.r. spectroscopy has enabled the determination of rate and activation parameters for aromatic ring rotations over a motional frequency range of 10–2–106 Hz in crystalline penicillin derivatives.
J. M. Twyman and C. M. Dobson, J. Chem. Soc., Chem. Commun., 1988, 786 DOI: 10.1039/C39880000786
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