Abstract
ABSTRACT: The detailed 1 Hand 13 C NMR assignments of the four known triterpenes 3 -hydroxyurs-12-en-28-oic acid, 3-oxo-24-methylenecycloartan, 3-oxo-11 -hydroxy-20(29)lupen and 29-hydroxyfriedelin, isolated from threeBrazilian plants, were achieved by 1D and 2D techniques such as DEPT, HETCOR, HMQC, HMBC, COSY andNOESY. Copyright 2000 John Wiley & Sons, Ltd.KEYWORDS: NMR; 1D NMR; 2D NMR; Triterpenoids; 1 Hand 13 C chemical shift assignments INTRODUCTION Two-dimensional NMR is becoming more and more aroutine tool in the elucidation of the chemical structuresof natural products. In the case of complex triterpenes,experiments such as HETCOR, HMQC, HMBC, COSYand NOESY allow the researcher to achieve unambiguousassignments for all hydrogen and carbons.Recent reports showed the results of the applicationof 1D and 2D NMR techniques for the identification ofthe structures and to determine the 1 Hand 13 CNMRassignments of some triterpenes of the series ursane, 1;2 artane, 3–8 lupane 9 and friedelane.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
