Metal-free desilylative C–C bond formation by visible-light photoredox catalysis
作者:Mustafa Uygur、Tobias Danelzik、Olga García Mancheño
DOI:10.1039/c8cc10239b
日期:——
A novel metal-free desilylative C–C bond formation from simple organosilanes by visible-light acridinium photoredox catalysis is presented.
通过可见光吖啶光还原催化,实现了从简单有机硅烷中无金属参与的脱硅碳-碳键形成。
Modularity in the C<sub>sp3</sub> Space─Alkyl Germanes as Orthogonal Molecular Handles for Chemoselective Diversification
作者:Aymane Selmani、Markus D. Schoetz、Adele E. Queen、Franziska Schoenebeck
DOI:10.1021/acscatal.2c00852
日期:2022.5.6
To meet the need for a rapid, streamlined, and potentially automatable molecule synthesis, modular coupling approaches are highly desired. While the diversification of aromatic molecules, i.e., Csp2 space, has greatly advanced, modular syntheses in the Csp3 space are comparably much less developed. This report explores the potential of alternative functional handles, i.e., alkyl germanes, in this context
为了满足对快速、流线型和潜在自动化分子合成的需求,非常需要模块化耦合方法。虽然芳族分子的多样化,即C sp2空间,已经取得了很大进展,但C sp3空间中的模块合成相对而言发展得少得多。本报告探讨了替代功能手柄的潜力,即烷基锗烷,在这种情况下,它结合了稳定性和可合成性的特征与选择性反应性。我们展示了烷基锗烷 (R-GeEt 3 ) 在光氧化还原条件下(Giese 加成)的化学选择性功能化以及在模块化构建块中的实现,这允许 C 的选择性多样化sp3 -halogen vs C sp3 -Bpin vs C sp3 -GeEt 3个位点。
Decatungstate Photocatalyzed Benzylation of Alkenes with Alkylaromatics
AbstractThe direct benzylation of electrophilic alkenes with alkylbenzenes has been achieved by decatungstate photocatalysis in a high ionic strength medium (5:1 acetonitrile/water mixed solvents, 0.5 M lithium perchlorate). The reaction has been extended to ring‐substituted (Cl, F, CN) toluenes and further alkylbenzenes. Intramolecular selectivity (p‐cymene, 4‐methylanisole) and deuteration effects support the atom transfer character of the process that, however, requires a sufficient stabilization of the intermediate polar exciplex to occur. The reactivity of the decatungstate anion is compared with that of aromatic ketones, the benchmark of photochemical hydrogen/electron transfer processes.magnified image
Decatungstate As Photoredox Catalyst: Benzylation of Electron-Poor Olefins
Excited tetrabutylammonium decatungstate (TBADT), known to activate a variety of compounds via hydrogen atom transfer (HAT), has now been applied as a photoredox catalyst for the effective oxidative cleavage of benzyl silanes and radical benzylation of reducible olefins occurring in isolated yields from poor to excellent.
Leaf Conductance of Primary and Mature Leaves of<i>Pinus roxburghii</i>: A Comparison
作者:Donald B. Zobel、Satish C. Garkoti、Surendra P. Singh