Abstract
A study of internal rotation in para-substituted dimethylanilines by 1H n.m.r. spectroscopy shows that the barrier to internal rotation of the dimethylamino-group is markedly dependent upon the nature of the para-substituent, and a Hammett correlation gives ΔG‡(at 133°K)= 5·1 (±1·0) kcal mol–1 for rotation in the parent compound dimethylaniline itself.
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