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。
The two faces of platinum hydrospirophosphorane complexes—Not only relevant catalysts but cytotoxic compounds as well
Platinumcomplexes [PtCl2(L)] L = L1, L2 with symmetrical HP (OCH2CMe2NH)2 (L1) and unsymmetrical HP(OCMe2CMe2O)(OCH2CMe2NH) (L2) hydrospirophosphorane (HSP) ligands were demonstrated to play a dual role of catalysts and cytotoxic compounds as well. The structure of new complex [PtCl2(L2)] was confirmed by physicochemical and spectroscopic methods, as well as single X-ray diffraction studies for [PtCl2P
Regio- and Stereoselective Dehydrogenative Silylation and Hydrosilylation of Vinylarenes Catalyzed by Ruthenium Alkylidenes
作者:Apparao Bokka、Junha Jeon
DOI:10.1021/acs.orglett.6b02642
日期:2016.10.21
Development of regio- and stereoselective dehydrogenativesilylation and hydrosilylation of vinylarenes with alkoxysilanes, catalyzed by ruthenium alkylidenes, is described. Varying L- and X-type ligands on ruthenium alkylidenes permits selective access to either (E)-vinylsilanes or β-alkylsilanes with high regio- and stereocontrol. cis,cis-1,5-Cyclooctadiene was identified as the most effective sacrificial
Manganese-Catalyzed Dehydrogenative Silylation of Alkenes Following Two Parallel Inner-Sphere Pathways
作者:Stefan Weber、Manuel Glavic、Berthold Stöger、Ernst Pittenauer、Maren Podewitz、Luis F. Veiros、Karl Kirchner
DOI:10.1021/jacs.1c09175
日期:2021.10.27
of aromatic and aliphaticalkenes was efficiently and selectively converted into E-vinylsilanes and allylsilanes, respectively, at room temperature. Mechanistic insights are provided based on experimental data and DFT calculations revealing that two parallel reaction pathways are operative: an acceptorless reaction pathway involving dihydrogen release and a pathway requiring an alkene as sacrificial
Direct synthesis of arylalkenylsilanes by [Rh(COD)Cl]2/PPh3-catalyzed dehydrogenative silylation of styrene derivatives with R3SiH (R = alkyl, alkoxy, aryl) was realized, in which norbornene (NBE) and PPh3 play a key role in achieving excellent selectivity in the formation of dehydrogenative silylation products. Moreover, this high-yielding transformation exhibits a broad substrate scope and good functional