Article révisé par les pairs
Résumé : Lithium‐aluminium hydride reduction of diacetoxy‐12,19‐dioxo‐Δ9 (11),13 (18)‐21‐epi‐methylmachaerinate yields 3β, 19ξ, 21α‐trihydroxy‐28‐noroleana‐9(11),12,17‐triene. LAH reduction of acetoxy‐H.‐dioxo‐Δ9(11), 13(18)‐methyloleanolate affords a 3:1 mixture of 3β, 28‐dihydroxy‐12,19‐oxido‐Δ9(11), 13(18) ‐oleananeand 3β,19ξ‐dihydroxy‐28‐noroleana‐9(ll),12,17‐triene. Copyright © 1968 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim