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Carbon‐13 NMR lanthanide induced shifts and T 1 studies of the conformation of friedelin
Author(s) -
Wazeer Mohammed I. M.
Publication year - 1985
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/mrc.1260230408
Subject(s) - friedelin , chemistry , lanthanide , reagent , steric effects , carbon 13 nmr , stereochemistry , proton nmr , crystallography , organic chemistry , triterpenoid , ion
By measuring the shifts of the 13 C NMR signals of 29 carbons of friedelin, induced by the lanthanide shift reagent Pr(fod) 3 , and using a computer program, it is shown that friedelin exists in a chair‐chair‐chair‐twist boat‐boat conformation in solution. Lanthanide metal binds exclusively to one site on the carbonyl group of friedelin, away from the nearest methyl group. 13 C T 1 data are consistent with the suggested conformation of friedelin.