Fluorine-19 nuclear magnetic resonance spectrum of para-bonded hexafluorobenzene
1969; Royal Society of Chemistry; Linguagem: Inglês
10.1039/j29690000253
ISSN2050-5590
Autores Tópico(s)Analytical Chemistry and Chromatography
ResumoThe six-spin AA′XX′X″X‴ system of hexafluoro 'Dewar' benzene has been analysed and values for all the F,F-coupling constants have thereby been obtained. The 19F n.m.r. spectrum consists of two complex groups of bands, one due to vinylic fluorines (ϕ* 122·8 p.p.m.) and the other to bridge fluorines (ϕ* 191·0). A calculated spectrum has been fitted to the experimental one and the following values of the coupling constants have been found: JAX±9·92, J′AX±7·12, JAA±9·36, JXX±0·10, J′XX±14·03, and J″XX±3·01 c./sec. Assignments of these coupling constants are discussed.
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