The n.m.r. spectra (–46°–+52°) of tricarbonyl(p-methoxyisopropylbenzene)chromium and tricarbonyl(p-methoxy-t-butylbenzene)chromium show that in these molecules the rotation of the Cr(CO)3 group relative to the arene ring is fast on the n.m.r. time scale.
G. Barbieri and F. Taddei, J. Chem. Soc. D, 1970, 312 DOI: 10.1039/C29700000312
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