The ‘dimethylene tartrates’ are shown to be bidioxolan-4-yl-5,5′-diones. Both cis- and trans-2-trichloromethyl-5-phenyldioxolan-4-ones have been isolated. N.m.r. assignments have been made for these and for other dioxolan-4-ones, and it is shown that long-range coupling between ring protons in this series occurs for trans- as well as for cis-stereoisomers.
L. A. Cort and R. A. Stewart, J. Chem. Soc. C, 1971, 1386 DOI: 10.1039/J39710001386
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