The temperature-dependent n.m.r. spectra of 2-(diacylmethylene)-1,3-dialkylimidazolidines show that the molecules are twisted around the carbon–carbon double bonds and that the planar states represent energy maxima; in the 1,3-dibenzyl derivatives the benzylic protons are non-equivalent at ambient temperature and hindered rotation of the acyl groups is also observed.
J. Sandström and I. Wennerbeck, J. Chem. Soc. D, 1971, 1088 DOI: 10.1039/C29710001088
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