A ruthenium porphyrin catalyses the epoxidation of several cholest-5-ene derivatives by air in high yield and with nearly complete β-stereospecificity; C-3-unprotected cholesterol is unaffected, but cholesteryl acetate gives nearly pure (>99%) 5β,6β-epoxide.
J. Marchon and R. Ramasseul, J. Chem. Soc., Chem. Commun., 1988, 298 DOI: 10.1039/C39880000298
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