Résumé : A complete assignment of the NMR methyl frequencies of Δ12‐oleanene triterpenes has been achieved. A list of additive chemical shifts permitting a priori calculation of the methyl frequencies for various substituents has been established. The synthesis of some new oleanenic derivatives is described. Copyright © 1967 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim