Nuclear spin-spin coupling via nonbonded interactions. 7. Effects of molecular structure on nitrogen-fluorine coupling
摘要:
To test whether the recently discovered phenomenon of through-space nuclear spin-spin coupling between intramolecularly crowded N-15 and F-19 nuclei shows the same sort of striking dependence on molecular structure as the long-known phenomenon of through-space nuclear spin-spin coupling between pairs of intramolecularly crowded F-19 nuclei, several N-15-enriched oximes and some simple derivatives thereof were synthesized and their J(NF) values were determined by F-19 NMR spectroscopy. The experimental J(NF) values ranged from 8.6 to 43.5 Hz. The molecular structures of these compounds were determined by single-crystal X-ray diffraction. The observed dependence of the N-15-F-19 coupling constants on molecular structure was qualitatively consistent with the predictions of the lone-pair orbital overlap theory that was developed earlier to account for through-space coupling involving fluorine nuclei.
Directive Influence of the Acetylamino Group in the Friedel--Crafts Acylation of the Acetylaminonaphthalenes
作者:Nelson J. Leonard、Archibald M. Hyson
DOI:10.1021/ja01172a071
日期:1949.4
Dziewonski; Sternbach, Bulletin International de l'Academie Polonaise des Sciences et des Lettres, Classe des Sciences Mathematiques et Naturelles, Serie A: Sciences Mathematiques, 1931, p. 59,66
作者:Dziewonski、Sternbach
DOI:——
日期:——
Nuclear spin-spin coupling via nonbonded interactions. 7. Effects of molecular structure on nitrogen-fluorine coupling
作者:Frank B. Mallory、Eddie D. Luzik、Clelia W. Mallory、Patrick J. Carroll
DOI:10.1021/jo00027a063
日期:1992.1
To test whether the recently discovered phenomenon of through-space nuclear spin-spin coupling between intramolecularly crowded N-15 and F-19 nuclei shows the same sort of striking dependence on molecular structure as the long-known phenomenon of through-space nuclear spin-spin coupling between pairs of intramolecularly crowded F-19 nuclei, several N-15-enriched oximes and some simple derivatives thereof were synthesized and their J(NF) values were determined by F-19 NMR spectroscopy. The experimental J(NF) values ranged from 8.6 to 43.5 Hz. The molecular structures of these compounds were determined by single-crystal X-ray diffraction. The observed dependence of the N-15-F-19 coupling constants on molecular structure was qualitatively consistent with the predictions of the lone-pair orbital overlap theory that was developed earlier to account for through-space coupling involving fluorine nuclei.
Harnik,M.; Jensen,E.V., Israel Journal of Chemistry, 1965, vol. 3, p. 13 - 23