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Carbon‐13 nuclear magnetic resonance spectra of some aromatic diterpenoids
Author(s) -
Nishida Toshiaki,
Wahlberg Inger,
Enzell Curt R.
Publication year - 1977
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270090406
Subject(s) - deuterium , chemistry , ring (chemistry) , benzene , carbon 13 , nuclear magnetic resonance , spectral line , decoupling (probability) , resonance (particle physics) , computational chemistry , stereochemistry , organic chemistry , atomic physics , physics , nuclear physics , astronomy , control engineering , engineering
13 C n.m.r. studies of a series of tricarbocyclic ring C aromatic diterpenoids using proton‐noise and single‐frequency off‐resonance decoupling, partially relaxed Fourier transform techniques, shift reagents and specifically labelled derivatives have permitted unequivocal assignments of almost all signals. The shieldings caused by oxygenation of C‐18 and C‐19 and by introduction of various substituents in the aromatic ring are discussed. It is concluded that the 13 C n.m.r. data are sufficiently characteristic to allow stereochemical assignments. Some effects of deuterium substitution on the carbon resonances are presented.