The use of symmetry in enantioselective synthesis: four pairs of chrysene enantiomers prepared from 19-nortestosterone

Expansion of the D-ring of 19-norsteroids with incorporation of the steroid C-18 methyl group into a newly formed six-membered ring provides easy access to the chrysene ring system. By taking advantage of the symmetry of the chrysene ring system and avoiding meso chrysene intermediates, four optical...

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