The low-temperature 1H n.m.r. spectra of PhCO·N(Me)·(CH2)n·N(Me)·COPh show four signals for the methyl groups when n![[gt-or-equal]](https://www.rsc.org/images/entities/char_2a7e.gif)
3, which are attributable to the presence of three rotational isomers. Only one isomer was detectable over a wide temperature range when n= 2. The rotational energy barriers have been measured and are close to that reported for NN-dimethylbenzamide.
G. Cirrincione, W. Hinz and R. A. Jones, J. Chem. Soc., Perkin Trans. 2, 1984, 1089 DOI: 10.1039/P29840001089
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