A number of rearrangements in ring C of the pentacyclic triterpene ursolic acid is described. The products have been examined and the mechanism of their formation is discussed. One of these products, the hydroxy‐acid VI, is of particular importance. It has been degraded by oxidation to products of low molecular weight, one of which, the acetoxy‐ketone XX, has been obtained previously from rings A and B of α‐amyrin.
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Arigoni et al. (1954) studied this question.