18-Norpregna-8,11,13-trienes: reaction of 16alpha, 17alpha-epoxypregn-8-en-11-ones with Lewis acids.
D004852:Epoxy Compounds; D006900:Hydroxylation; D009650:Norpregnanes / Q000138:chemical synthesis; D011281:Pregnatrienes / Q000138:chemical synthesis*; D011282:Pregnenediones / Q000138:chemical synthesis
D004852:Epoxy Compounds; D009650:Norpregnanes; D011281:Pregnatrienes; D011282:Pregnenediones