Abstract
Application of N.M.R.
methyl resonance data led to revision of the structures given to the two cis 2,3-diols resulting from osmium tetroxide oxidation of methyl oleana-2,12-dien-28-oate
(10). 2α,3α-Dihydroxyolean-l2-en-28-oic acid (6a), a new natural
product, occurs in Shorea acuminata
resin. Other constituents are 2α-hydroxy-ursolic acid (14a), mangiferonic acid (15b), and asiatic
acid (14c). S. resina-nigra
contains β-amyrin (16a), ursolaldehyde
(14f), and Ψ-taraxesterol(17a).
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