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19F n.m.r spectra of heptafluoroisoquinoline and hexafluoro-1-methoxyisoquinoline. Long-range inter-ring coupling constants

✍ Scribed by R. S. Matthews

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
382 KB
Volume
8
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

An analysis of the ^19^F n.m.r. spectra of heptafluoroisoquinoline and hexafluoro‐1‐methoxyisoquinoline is presented. As in heptafluoroquinoline, the inter‐ring FF coupling constants alternate in sign and magnitude and are positive over an odd number of bonds. They correlate with SCFMO carbon–carbon polarizabilities and this infers that the long‐range coupling mechanism is dominated by the contribution from the π‐electron system.

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## Abstract The ^19^F n.m.r. spectrum of hexafluoroquinazoline has been analyzed giving the signs and magnitudes of all but two of the coupling constants, and supporting the analyses of the ^19^F n.m.r. spectra of heptafluoroquinoline and heptafluoroisoquinoline. Long range FF inter‐ring coupling