The versatile rhodium trichloride trihydrate has been employed in catalytic amounts to promote double-bond migration. This method allows good yields in otherwise difficult, or impossible, exocyclic–endocyclic isomeris-ations. The rearrangement of ergosterol was found to be more complex. Besides known isomers a new cis-AB-ergosterol isomer has been isolated.
J. Andrieux, D. H. R. Barton and H. Patin, J. Chem. Soc., Perkin Trans. 1, 1977, 359 DOI: 10.1039/P19770000359
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