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。
New organoplatinum (IV) complex with quaterpyridine ligand: Synthesis, structure and its catalytic activity in the hydrosilylation of styrene and terminal alkynes
The reaction of ligand L with PtCl2 leads to a novel structural motif of octahedral ortho-metalated complex of formula [Pt(L-H)Cl-3] I. This result is a consequence of drastic conditions of reaction and preferred Pt(IV) octahedral coordination geometry. The new compound has been characterised on the basis of the spectroscopic data in solution, and its structure confirmed in the solid state by X-ray crystallography (1a-[Pt(L-H)Cl-3].MeOH, 1b-[Pt(LH)Cl-3]center dot C6H5CH3). This article reports organoplatinum (IV) complex 1 as effective and highly selective catalyst precursor in the hydrosilylation of styrene and terminal alkynes. (C) 2013 Elsevier B.V. All rights reserved.