13C NMR assignment of dammarane triterpenes and dendropanoxide: Application of 2D long‐range 13C1H correlation spectra

The 13C NMR chemical shifts of some dammarane‐type triterpenes, produced by oxidation of dammaran‐20(S)‐ol and 20(S)‐hydroxydammaran‐3β‐yl acetate with m‐chloroperbenzoic acid, were assigned by complete analysis of these compounds using 2D long‐range 13C1H correlation spectra and 2D INADEQUATE; it was found necessary to revise previous assignments. The 13C NMR signals of dendropanoxide were also analysed by 2D techniques including HHC relayed 13C1H correlation spectra.