Further Nuclear Magnetic Resonance Studies of Flavone

The incorporation of 92.7% of 13 C at the carbonyl group of flavone allowed to measure two‐ and three‐bond carbon‐carbon coupling constants which range from 1.4 to 3.5 Hz, and to measure two‐, three‐ and four‐bond carbon‐hydrogen coupling constants which range from 0.3 to 3.8 Hz. A mixture of unlabe...

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Bibliographic Details
Published in:Journal of spectroscopy (Hindawi) 1994-01, Vol.12 (2), p.85-89
Main Authors: García-Martínez, Cirilo, Morales-Rios, Martha S., Joseph-Nathan, Pedro
Format: Article
Language:English
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Summary:The incorporation of 92.7% of 13 C at the carbonyl group of flavone allowed to measure two‐ and three‐bond carbon‐carbon coupling constants which range from 1.4 to 3.5 Hz, and to measure two‐, three‐ and four‐bond carbon‐hydrogen coupling constants which range from 0.3 to 3.8 Hz. A mixture of unlabelled flavone 1 with its 4‐ 13 C labelled analogue 2 further allowed to measure one‐bond induced isotope shifts of ‐15.5 and ‐16.2 ppb for C‐3 and C‐4a, respectively, and a three bond induced isotope shift of +3.7 ppb for C‐I′.
ISSN:2314-4920
2314-4939
DOI:10.1155/1994/297058