Holǐk, M. and Turečková, M. and Mannschreck, Albrecht and Stühler, G. (1982) Anwendung der NMR-Spektroskopie chiraler Assoziate 11: Rotation about the C(sp²)—C(aryl) Bond in 2,6-Difluorobenzamides Studied by ¹⁹F NMR. Organic Magnetic Resonance 19 (3), pp. 121-125.
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The energy barrier to rotation about the C(sp2)C(aryl) single bond in non-planar N,N-dimethyl-, N,N-tetramethylene-, N,N-diisopropyl-2,6-difluorobenzamides and in N,N-dimethyl-2-chloro-6-fluorobenzamide was investigated by 19F NMR in the presence of an optically active shift reagent. The free energy of activation was calculated from the coalescence temperature of the fluorine signals; the calculation was accomplished using the simple, approximative equation and, also, by the graphical procedure including the (eigen) line width, i.e. without the broadening caused by two-site exchange. A distinct effect of the size of the N-substituents on the ΔGc‡values was observed, in accordance with expectation.
|Additional information (public):||späterer Zeitschr.titel: Magnetic resonance in chemistry|
|Institutions:||Chemistry and Pharmacy > Institut für Organische Chemie > Retired Professors > Prof.Dr. Mannschreck|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||01 Dec 2010 09:55|
|Last Modified:||01 Dec 2010 09:55|