Regiodivergent hydrosilylation, hydrogenation, [2π + 2π]-cycloaddition and C–H borylation using counterion activated earth-abundant metal catalysis
作者:Riaz Agahi、Amy J. Challinor、Joanne Dunne、Jamie H. Docherty、Neil B. Carter、Stephen P. Thomas
DOI:10.1039/c8sc05391j
日期:——
The widespread adoption of earth-abundant metal catalysis lags behind that of the second- and third-row transitionmetals due to the often challenging practical requirements needed to generate the active low oxidation-state catalysts. Here we report the development of a single endogenous activation protocol across five reaction classes using both iron- and cobalt pre-catalysts. This simple catalytic
Synthesis of lanthanide(II)–imine complexes and their use in carbon–carbon and carbon–nitrogen unsaturated bond transformation
作者:Ken Takaki、Kimihiro Komeyama、Katsuomi Takehira
DOI:10.1016/j.tet.2003.06.003
日期:2003.12
1 quantitatively, the structure of which was characterized by X-ray analysis. The imine complexes 1 catalyzed dehydrogenativesilylation of terminal alkynes, hydrosilylation of imines and alkenes, and intermolecular hydrophosphination of alkynes. Moreover, dehydrogenative double silylation of conjugated dienes was achieved with 1.
Divalent lanthanide–imine complexes and a related species catalyzed the hydrosilylation of olefins with phenyl- and diphenylsilane. On the other hand, conjugated dienes were converted to 1,4-bissilyl-2-butenes and 3-silacyclopentenes, accompanied with hydrogen evolution, under similar conditions.
The cobalt(II) complex of a new tridentate Schiff-base ligand as a catalyst for hydrosilylation of olefins
作者:Adam Gorczyński、Maciej Zaranek、Samanta Witomska、Aleksandra Bocian、Artur R. Stefankiewicz、Maciej Kubicki、Violetta Patroniak、Piotr Pawluć
DOI:10.1016/j.catcom.2016.02.009
日期:2016.3
new, tridentate Schiff-base ligand L, which readily reacts with CoCl2 to form a monometallic [CoLCl2] complex that, upon reduction, functions as active hydrosilylation catalyst. The ligand and the [CoLCl2] catalyst have been characterized spectroscopically (MS, NMR, FTIR) and by single crystal X-ray diffraction techniques. The results of preliminary catalytic experimentation show that the cobalt complex
1-甲基-2-咪唑甲醛与2-(1-甲基肼基)吡啶的缩合导致合成新的三齿席夫碱配体L,该配体容易与CoCl 2反应形成单金属[Co L Cl 2 ]配合物还原后,用作活性氢化硅烷化催化剂。所述配体和[Co L Cl 2 ]催化剂已经通过光谱法(MS,NMR,FTIR)和通过单晶X射线衍射技术进行了表征。初步催化实验的结果表明,取决于所用的氢硅烷底物,钴配合物可引起烯烃的氢化硅烷化和脱氢甲硅烷基化。
Phosphinite-Iminopyridine Iron Catalysts for Chemoselective Alkene Hydrosilylation
作者:Dongjie Peng、Yanlu Zhang、Xiaoyong Du、Lei Zhang、Xuebing Leng、Marc D. Walter、Zheng Huang
DOI:10.1021/ja404963f
日期:2013.12.26
characterized. These iron compounds are efficient and selective catalysts for the anti-Markovnikov alkenehydrosilylation of primary, secondary, and tertiarysilanes. More importantly, the system exhibits unprecedented functional group tolerance with reactive groups such as ketones, esters, and amides. Furthermore, the iron-catalyzed alkenehydrosilylation was successfully applied to the synthesis of a valuable