The n.m.r. spectra of both the cis- and trans-forms of five 2,5-disubstituted 1,3-dioxolan-4-ones show long-range coupling between 2-H and 5-H thus confirming that the mere presence of such coupling cannot be used to assign a cis-relationship to the substituents at C-2 and C-5.
R. Brettle and I. D. Logan, J. Chem. Soc., Perkin Trans. 2, 1973, 687 DOI: 10.1039/P29730000687
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