X-Ray crystallography shows that levopimaric acid has a folded conformation in the solid state in agreement with conclusions derived earlier from its o.r.d. spectrum, and this is explained in terms of the ‘4,4-dimethyl effect’.
U. Weiss, W. B. Whalley and I. L. Karle, J. Chem. Soc., Chem. Commun., 1972, 16 DOI: 10.1039/C39720000016
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