The 1H n.m.r. spectra of 1,5-diacetyl-4-hydroxy-4-methylbicyclo[3.1.0]hexan-2-ones (2) and (3) and diethyl 4-hydroxy-4-methyl-2-oxobicyclo[3.1.0]hexane-1,5-dicarboxylate (6) were determined in the presence of the shift reagent Eu(fod)3. The observed induced shifts provide evidence for the relative configuration of the asymmetric centres of these compounds.
G. Adembri, C. Anselmi, L. R. Lampariello, M. Scotton and A. Sega, J. Chem. Soc., Perkin Trans. 2, 1985, 1297 DOI: 10.1039/P29850001297
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