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19 F n.m.r spectra of heptafluoroisoquinoline and hexafluoro‐1‐methoxyisoquinoline. Long‐range inter‐ring coupling constants
Author(s) -
Matthews R. S.
Publication year - 1976
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270081208
Subject(s) - coupling constant , spectral line , ring (chemistry) , sign (mathematics) , coupling (piping) , range (aeronautics) , chemistry , atomic physics , molecular physics , physics , materials science , mathematics , quantum mechanics , organic chemistry , mathematical analysis , composite material , metallurgy
An analysis of the 19 F n.m.r. spectra of heptafluoroisoquinoline and hexafluoro‐1‐methoxyisoquinoline is presented. As in heptafluoroquinoline, the inter‐ring FF 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.