Fluorine deshielding in the proximity of a methyl group. An experimental and theoretical study
作者:Gordon W. Gribble、Daniel J. Keavy、Erik R. Olson、Ian D. Rae、Alfred Staffa、Tomas E. Herr、Marta B. Ferraro、Rubén H. Contreras
DOI:10.1002/mrc.1260290504
日期:1991.5
19F chemicalshifts are reported for a series of alkyl‐substituted fluoronaphthalenes and related compounds that exhibit steric crowding around the fluorine atom due to the proximity of methyl groups. Comparisons of these chemicalshifts with others measured in similar compounds but without the corresponding methyl groups show that this crowding effect produces a large low‐field shift of the 19F signal
Reinterpretation of long-range 1H-19F spin—spin coupling in 1,4-dihydro-1,4-epoxynaphthalenes and related systems
作者:Gordon W. Gribble、William J. Kelly
DOI:10.1016/s0040-4039(01)92936-3
日期:1981.1
The long-range 1H-19F coupling reported earlier for the bridgehead proton(s) in 1,4-dihydro-1,4-epoxynaphthalenes (e.g., ) is shown unequivocally to involve the distal fluorine by a five-bond zig-zag coupling pathway.
较早前报道的1,4-二氢-1,4-环氧萘(例如)中桥头质子的远程1 H - 19 F偶合清楚地表明是通过五键Zig- zag耦合途径。