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Interbenzylic 19F,19F spin-spin coupling constants in bis(fluoromethyl) arenes

✍ Scribed by Ludger Ernst; Sabine Pulmann

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
174 KB
Volume
16
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Five‐ to eleven‐bond F,F spin coupling is observed in bis(fluoromethyl)arenes. According to INDO MO calculations, these couplings are transmitted mainly via the aromatic π‐system. The low preference of 1,4‐(CH~2~F)~2~‐benzene for the conformation in which the CF bonds are perpendicular to the aromatic ring is
shown by the strong increase of^7^J(FF) upon double ortho‐substitution.

📜 SIMILAR VOLUMES

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## Abstract The observation of long range (10–14 bond) spin–spin coupling between fluorine nuclei (which are very far apart in space) is used to provide information about electronic interactions in bridged dinuclear aromatic compounds.

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## Abstract In 2‐trifluoromethylphenyldifluorophosphine the proximate couplings ^4^__J__(^19^F^31^P) and ^5^__J__(^19^F^19^F) are + 68.3 and + 8.3 Hz, respectively. ^1^__J__(^13^C^31^P) is −57.0 Hz, ^2^__J__(^13^C‐1, ^10^F) is + 9.9 Hz and ^2^__J__(^13^C‐6, ^13^C‐6, ^31^P) is + 10.1 Hz. The trifluo

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## Abstract The details of two‐dimensional ^13^C^1^H correlated spectra have provided information about the relative signs of __J__(C, F) and __J__(F, H) for several molecules in which C, F and H are mutually coupled. Unlike signs are found for __J__(C, F) and __J__(F, H) when the coupling pathway

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## Abstract The signs of the spin–spin coupling constants between the aldehydic proton and the fluorine nuclei in pentafluorobenzaldehyde are negative over four and six formal bonds and positive over five bonds. The opposite signs had been assumed in previous studies of this molecule. The correct s