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13 C NMR Assignments of D : C ‐Friedours‐7‐ene Derivatives. Evidence of an Abnormal Methyl Group Chemical Shift
Author(s) -
CerdaGarcíaRojas Carlos M.,
HernándezVidal Héctor H.,
JosephNathan Pedro
Publication year - 1996
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199610)34:10<777::aid-omr967>3.0.co;2-0
Subject(s) - chemistry , triterpene , carbon 13 nmr , stereochemistry , ene reaction , chemical shift , medicine , alternative medicine , pathology
The 13 C NMR assignments of four D : C ‐friedours‐7‐ene derivatives were carried out on the basis of 2D shift‐correlated NMR techniques (HETCOR and FLOCK), revealing that the signal for C H 3 ‐28 appears always very deshielded ( ca . δ = 38.0). The conformation of the triterpene skeleton, obtained by MMX calculations, is compared with that of multiflor‐7‐ene.