A second, previously unreported tetrahydro derivative has been isolated from the high pressure hydrogenation product of methyl isopimarate. Its structure is established as methyl 8α-isopimaran-18-oate by X-ray crystallography and 1H n.m.r. spectroscopy.
D. F. Zinkel, R. C. Pettersen, T. Haromy and M. Sundaralingam, J. Chem. Soc., Perkin Trans. 1, 1987, 1975 DOI: 10.1039/P19870001975
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