Abstract
AbstractThe 13C NMR spectra of some hydroxylated ent‐kaurane diterpenoids were measured in CDCl3‐Py‐d5 (1:1) solution and also after addition of boric acid. Complexation of ent‐3β,18‐, ent‐7α,15β‐, ent‐7α,15α‐, ent‐15β,16β‐ and ent‐16β,17‐dihydroxy derivatives with boric acid produced considerable chemical shift changes and marked broadening of the signals of the hydroxy‐bearing and neighbouring carbon atoms. This behaviour provides a useful and reliable method for assigning the 13C NMR spectra of these compounds.
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