Solvent-induced shifts in the n.m.r. signals of the methyl groups in the 4β- and 4α-hydroxysantonenes (IIa) and (IIIa) and their derivatives have been used to confirm the configuration and conformation of the 4-hydroxy-groups in these compounds. The n.m.r. spectra of 6-substituted santonenes are also recorded.
D. S. R. East, T. B. H. McMurry and R. C. Mollan, J. Chem. Soc. C, 1970, 2008 DOI: 10.1039/J39700002008
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