1H and13C spectra of fluorine‐containing polycyclic aromatic hydrocarbons.1H19F and13C19F coupling across bay regions
作者:
D. J. Sardella,
E. Boger,
期刊:
Magnetic Resonance in Chemistry
(WILEY Available online 1989)
卷期:
Volume 27,
issue 1
页码: 13-20
ISSN:0749-1581
年代: 1989
DOI:10.1002/mrc.1260270104
出版商: John Wiley&Sons, Ltd.
关键词: 1H NMR;13C NMR;Fluorine‐containing polycyclic aromatic hydrocarbons;Anomalous F‐induced shifts and couplings
数据来源: WILEY
摘要:
AbstractThe1H and13C NMR spectra of several fluorine‐substituted polycyclic aromatic hydrocarbons in which fluorine projects into a bay region were studied. Both protons and carbons of the sterically opposed CH bond show anomalously large F‐induced shifts and couplings to fluorine. The magnitudes of the couplings (particularly the four‐bond CF couplings which average 26 Hz) indicate a large through‐space contribution due to direct overlap between fluorine and CH bond orbitals, whereas the F‐induced shifts seem more likely to stem from diamagnetic anisotropy rather than F‐induced CH bond p
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