Steric Crowding Makes Challenging C(sp3)-F Reductive Eliminations Feasible [0.03%]
拥挤的 sterics 使具有挑战性的 C(sp3)-F 前线消除反应成为可能
Shu-Bin Zhao,Jennifer J Becker,Michel R Gagné
Shu-Bin Zhao
A high-yielding fluorination of (triphos)Pt-R(+) has been achieved using an array of F(+) sources, with XeF(2) yielding R-F in minutes. The C-F coupling proved to be a stereoretentive process that proceeds via a concerted reductive eliminat...
Rearrangement/Fragmentation Reactions of Oligosilanes with Aluminum Chloride [0.03%]
氯化铝催化下低聚硅烷的重排/断裂反应研究
Harald Wagner,Judith Baumgartner,Christoph Marschner et al.
Harald Wagner et al.
Reinvestigation of the Lewis acid catalyzed rearrangement of some open-chain permethyloligosilanes with the Al(Fe)Cl(3) catalyst system exhibited several cases of additional reactivity: namely, a fragmentation/cyclization reaction. Introduc...
Conformational Control of Polysilanes: Use of CH(2) Spacers in the Silicon Backbone [0.03%]
含CH(2)间隔基聚硅烷构象的研究
Andreas Wallner,Johann Hlina,Harald Wagner et al.
Andreas Wallner et al.
By the reaction of a number of oligosilyl potassium compounds with (trimethylsilyl)chloromethane, derivatives containing the (trimethylsilyl)methyl substituent were prepared. Using X-ray single-crystal structure analysis and UV spectroscopy...
Coordination Driven Self-Assembly and Anticancer Activity of Molecular Rectangles Containing Octahedral Ruthenium Metal Centers [0.03%]
具八面体金属钌中心的分子矩形的协同自组装及其抗肿瘤活性
Vaishali Vajpayee,Young Ho Song,Yoon Jung Yang et al.
Vaishali Vajpayee et al.
The synthesis of new 2+2 metalla-rectangles via coordination driven self-assembly of octahedral Ru(II) based acceptors and amide donors is described. To evaluate their in vitro cytotoxic properties, preliminary biological assays were carrie...
Room Temperature Z-Selective Homocoupling of α Olefins by Tungsten Catalysts [0.03%]
室温下用钨催化剂选择性催化α-烯烃Z型偶联反应
Smaranda C Marinescu,Richard R Schrock,Peter Müller et al.
Smaranda C Marinescu et al.
Characterization of Tunable Radical Metal-Carbenes: Key Intermediates in Catalytic Cyclopropanation [0.03%]
可调谐自由基金属亚甲基的表征：环丙烷化催化中的关键中间体
Jonathan L Belof,Christian R Cioce,Xue Xu et al.
Jonathan L Belof et al.
A new class of radical metal-carbene complex has been characterized as having Fischer-like orbital interactions and adjacent π acceptor stabilization. Density Functional Theory (DFT) along with Natural Bond Orbital (NBO) analysis and Charg...
Ruthenium Olefin Metathesis Catalysts Bearing Carbohydrate-Based N-Heterocyclic Carbenes [0.03%]
基于糖类的N-杂环卡宾负载的钌烯烃元催化剂
Benjamin K Keitz,Robert H Grubbs
Benjamin K Keitz
Ru-based olefin metathesis catalysts containing carbohydrate-derived NHCs from glucose and galactose were synthesized and characterized by NMR spectroscopy. 2D-NMR spectroscopy revealed the presence of Ru-C (benzylidene) rotamers at RT and ...
Driving Catalyst Reoxidation in Wacker Cyclizations with Acetal-Based Metal-Hydride Abstractors [0.03%]
基于缩醛的金属氢化物萃取剂促进Wacker环化反应中的催化剂再氧化
Nikki A Cochrane,Maurice S Brookhart,Michel R Gagné
Nikki A Cochrane
In traditional Wacker processes, Pd(II) becomes reduced to Pd(0) after C-O bond formation and β-H elimination and must be reoxidized to the electrophilic Pd(II) state via a stoichiometric oxidant like benzoquinone, CuCl(2), or O(2). We rep...
Hydrosilation of Carbonyl-Containing Substrates Catalyzed by an Electrophilic η-Silane Iridium(III) Complex [0.03%]
阳离子Ir(III)配合物催化含羰基底物的水合硅加成反应
Sehoon Park,Maurice Brookhart
Sehoon Park
Hydrosilation of a variety of ketones and aldehydes using the cationic iridium catalyst, (POCOP)Ir(H)(acetone)(+), 1, (POCOP = 2,6-bis(di-tert-butyl phosphinito)phenyl) is reported. With triethyl silane, all but exceptionally bulky ketones ...
Synthesis of Highly Stable 1,3-Diaryl-1H-1,2,3-triazol-5-ylidenes and their Applications in Ruthenium-Catalyzed Olefin Metathesis [0.03%]
稳定的一取代及二取代1,3- diaryl-1H-1,2,3-三唑基烯烃的合成及其在钌催化体系中 olefin 库泊烯代谢中的应用
Jean Bouffard,Benjamin K Keitz,Ralf Tonner et al.
Jean Bouffard et al.
The formal cycloaddition between 1,3-diaza-2-azoniaallene salts and alkynes or alkyne equivalents provides an efficient synthesis of 1,3-diaryl-1H-1,2,3-triazolium salts, the direct precursors of 1,2,3-triazol-5-ylidenes. These N,N-diarylat...