Nuclear magnetic resonance spectroscopy. Carbon-13 spectra of five-membered aromatic heterocycles
β Scribed by Weigert, Frank J.; Roberts, John D.
- Book ID
- 121485458
- Publisher
- American Chemical Society
- Year
- 1968
- Tongue
- English
- Weight
- 813 KB
- Volume
- 90
- Category
- Article
- ISSN
- 0002-7863
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## Abstract ^13^C n.m.r. studies of a series of tricarbocyclic ring C aromatic diterpenoids using protonβnoise and singleβfrequency offβresonance decoupling, partially relaxed Fourier transform techniques, shift reagents and specifically labelled derivatives have permitted unequivocal assignments o
REFERENCE DATA causes the electron density to be comparatively lower at C-3 and C-5 than at C-2 and C-4, so that the former signals resonate at lower fields. Distinction between the signals of the C-2/C-4 and C-3/C-5 pairs was achieved by comparing the C-H coupling patterns of 5 and 1. Compounds 1,