The title compounds, with their line dissymmetric perturber methyl groups in very similar locations relative to the C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
O group, exhibit n →π* Cotton effects of considerably different magnitudes in their circular dichroism spectra run in n-pentane:Δε302=–2.4 for the former, Δε295=–0.6 for the latter.
S. L. Rodgers, N. Kalyanam and D. A. Lightner, J. Chem. Soc., Chem. Commun., 1982, 1040 DOI: 10.1039/C39820001040
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