The variable-temperature n.m.r. spectra of some tricarbonyl(arene)chromium compounds can be explained in terms of varying conformer populations i.e. in the terminology of Mislow and Raban, “thermodynamic restriction of rotation” occurs: no evidence can be found for “kinetic restriction” even for spectra of tricarbonyl-(1,4-di-t-butyl-2,5-dimethoxybenzene)chromium at –80°.
W. R. Jackson, W. B. Jennings and R. Spratt, J. Chem. Soc. D, 1970, 593 DOI: 10.1039/C29700000593
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