A study of the 1H n.m.r. spectra of three diphenylallyl carbanions in the range 30 to –60 °C has revealed the occurrence of rotational processes. The 1,3-diphenylallyl and 1-methyl-1,3-diphenylallyl carbanions exhibit hindered rotation of the phenyl groups, whilst the 2-methyl-1,3-diphenylallyl carbanion additionally shows hindered rotation about the C–C bonds of the allyl system.
J. W. Burley and R. N. Young, J. Chem. Soc., Perkin Trans. 2, 1972, 1843 DOI: 10.1039/P29720001843
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