The title dilactone has been resolved into its enantiomers (+)- (S,S)-1 and (–)-(R,R)- 1, whose absolute configurations were found by X-ray diffraction analysis of intermediate lactonic amide 2a; the magnitude of the n–π* Cotton effect increased with an increase in folding or a diminution in twist of the boat conformation of a dilactone ring.
I. V. Vystorop, A. N. Utyenyshev, V. M. Anisimov and R. G. Kostyanovsky, Mendeleev Commun., 1999, 9, 229 DOI: 10.1070/MC1999v009n06ABEH001192
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