In concentrated sulphuric acid at 0° all-trans-tetrahydroabietic acid (I) has been shown to rearrange to optically inactive7-(1,1-dimethyltetradecahydrophenanthryl)dimethylacetic acid (III).
B. E. Cross, M. R. Firth and R. E. Markwell, J. Chem. Soc., Chem. Commun., 1974, 930 DOI: 10.1039/C39740000930
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