Nuclear magnetic resonance spectra of benzylsilanes and phenyldisilanes
作者:Frank K. Cartledge、Knut H. Riedel
DOI:10.1016/s0022-328x(00)88667-2
日期:1972.1
of substituted benzyldimethylsilanes (I) and phenyltetramethyldisilanes (II) are reported. 29SiH and 13CH coupling constants are shown to be correlated by Hammett σ constants. The data are discussed in terms of mechanisms of transmission of substituent effects across C—Si and Si—Si bonds. A good Hammettcorrelation is also found of J(13CH) for the benzylic protons of a series of substituted toluenes
Organosilane cation radicals which have tethered nucleophiles are found to undergo rapid intramolecular nucleophilic substitution in both high and low polarity solvents. This reaction competes with both separation and return electron transfer within the primary ionradicalpair generated by photoinduced bimolecular electron transfer. These results demonstrate the ability to effect ionradical substitutions
Silyl-Directed, Iridium-Catalyzed <i>ortho</i>-Borylation of Arenes. A One-Pot <i>ortho</i>-Borylation of Phenols, Arylamines, and Alkylarenes
作者:Timothy A. Boebel、John. F. Hartwig
DOI:10.1021/ja8015878
日期:2008.6.18
regioselectivity of the borylation of arenescatalyzed by the combination of 4,4'-di-tert-butylbipyridine (dtbpy) and [Ir(cod)Cl]2 has typically been governed by steric effects. We describe a strategy that makes use of a new substituent for ortho-functionalization to overcome this bias. We show that arenes containing hydrosilyl substituents on an atom attached to the arene ring undergo borylation at the position
Iridium-catalyzed Dehydrogenative Dimerization of Benzylmethylsilanes via Silylation of C(sp<sup>3</sup>)–H Bonds Adjacent to a Silicon Atom
作者:Masahito Murai、Yutaro Takeuchi、Kazuhiko Takai
DOI:10.1246/cl.170369
日期:2017.7.5
Dehydrogenative dimerization of benzylmethylsilanes under iridium catalysis via site-selective sequential silylations of a C(sp3)–H bond of the methyl group and ortho C(sp2)–H bond of the benzyl group is described. Silicon-containing heterocycles were obtained in a single step from readily available functionalized benzylmethylsilanes.