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Influence of the introduction of fluorine atoms on the 13C NMR spectra of acrylic esters

✍ Scribed by Laurence Marival-Hodebar; Marc Tordeux; Claude Wakselman

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 62 KB
Volume: 37
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199908)37:8<579::aid-mrc497>3.0.co;2-x

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✦ Synopsis

The effect of progressive introduction of fluorine atoms on the 13 C chemical shifts in the ˇ,ˇdimethylacrylic ester series is examined. The main perturbation is located at the olefinic carbons positions. Comparison of the various data allows the calculation of increments corresponding to the substitution of methyl groups by CH 2 F, CHF 2 or CF 3 groups. The perturbation induced on the vinylic carbons increases roughly with the number of fluorine atoms. However, an influence of the stereochemistry is observed in the CH 2 F and CF 3 series. The increments are not additive for compounds bearing two highly fluorinated groups at the ˇ-positions.

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