Carbon-13 n.m.r. spectrometry leads unequivocally to the assignment of sodium c-3-acetoxy-2-oxo-t-4,c-5-diphenylcyclo-pentane-r-1-sulphonate (III), and necessitates revision of the cyclopentenyl structure (II) originally suggested, as the product obtained from trans,trans-dibenzylideneacetone and conc.sulphuric acid–acetic anhydride.
C. W. Shoppee and B. J. A. Cooke, J. Chem. Soc., Perkin Trans. 1, 1974, 189 DOI: 10.1039/P19740000189
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