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Solvent effects on the 1H1H, 1H19F and 19F19F coupling constants of fluorobenzene and 1,2-difluorobenzene

✍ Scribed by Sirpa Suntioinen; Reino Laatikainen

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 357 KB
Volume: 30
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260300512

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✦ Synopsis

Abstract

The ^1^H and ^19^F NMR spectra of fluorobenzene and 1,2‐difluorobenzene were measured in several pure solvents and in binary solvent mixtures to study the solvent dependence of ^1^H^19^F and ^19^F^19^F coupling constants. The solvents are distinctly divided into two groups on the basis of their hydrogen bonding properties. Most the coupling constants increase with increasing polarity of the solvent within both groups. The ^3^J(F,H) and ^4^J(F,H) coupling constants are typically increased by 4‐7% when the solvent is changed from cyclohexane to acetone. For the ^5^J(F,H) coupling of fluorobenzene the change is as large as 70%.

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