<i>N</i>-Methyl-Benzothiazolium Salts as Carbon Lewis Acids for Si−H σ-Bond Activation and Catalytic (De)hydrosilylation
作者:Valerio Fasano、James E. Radcliffe、Liam D. Curless、Michael J. Ingleson
DOI:10.1002/chem.201604613
日期:2017.1.1
N−Me‐Benzothiazolium salts are introduced as a new family of Lewis acids able to activate Si−H σ bonds. These carbon‐centred Lewis acids were demonstrated to have comparable Lewis acidity towards hydride as found for the triarylboranes widely used in Si−H σ‐bond activation. However, they display low Lewis acidity towards hard Lewis bases such as Et3PO and H2O in contrast to triarylboranes. The N−Me‐benzothiazolium
The combination of hexamethyldisilane and a catalytic amount of [PdCl(η3-C3H5)]2–PPh3 was found to be effective for the trimethylsilylation of alcohols, where both of the two trimethylsilyl groups of hexamethyldisilane were transferred to alcohols without coproduction of any stoichiometric amount of byproduct but H2.
Rhodium-Catalyzed Dehydrogenative Silylation of Acetophenone Derivatives: Formation of Silyl Enol Ethers versus Silyl Ethers
作者:Karin Garcés、Ralte Lalrempuia、Víctor Polo、Francisco J. Fernández-Alvarez、Pilar García-Orduña、Fernando J. Lahoz、Jesús J. Pérez-Torrente、Luis A. Oro
DOI:10.1002/chem.201602760
日期:2016.10.4
[Rh(H)(Cl)(NSiN)(PCy3)] (Cy=cyclohexane) and [Rh(H)(CF3SO3)(NSiN)(coe)] (coe=cis‐cyclooctene). The [Rh(H)(CF3SO3)(NSiN)(coe)]‐catalyzed reaction of acetophenone with silanes performed in an open system was studied. Interestingly, in most of the cases the formation of the corresponding silyl enol ether as major reaction product was observed. However, when the catalytic reactions were performed in closed systems
报道了一系列铑-NSiN配合物(NSiN =双(吡啶-2-基氧基)甲基甲硅烷基fac配位),包括[Rh(H)(Cl)(NSiN)(PCy 3)的固态结构]( Cy =环己烷)和[Rh(H)(CF 3 SO 3)(NSiN)(coe)](coe =顺式-环辛烯)。[Rh(H)(CF 3 SO 3)(NSiN)(coe)]-苯乙酮与硅烷在开放系统中进行的催化反应进行了研究。有趣的是,在大多数情况下,观察到形成了相应的甲硅烷基烯醇醚作为主要反应产物。但是,当催化反应在密闭系统中进行时,有利于形成相应的甲硅烷基醚。此外,[Rh(H)(CF 3 SO 3)(NSiN)(coe)]与HSiMe 3反应的理论计算苯乙酮表明,甲硅烷基烯醇醚的形成在动力学上是有利的,而甲硅烷基醚是热力学的产物。脱氢甲硅烷基化需要通过金属-配体协同机制进行Si-H键的杂合裂解,这是决定速率的步骤。从配位的三甲基甲硅烷基硫酸盐
Reduction of carbonyl compounds via hydrosilylation
作者:Iwao Ojima、Tetsuo Kogure、Miyoko Kumagai、Shuji Horiuchi、Toshikazu Sato
DOI:10.1016/s0022-328x(00)92750-5
日期:1976.12
asymmetric reduction of alkyl phenyl, dialkyl and alkyl cyclohexyl ketones has been achieved via hydrosilylation, catalyzed by a rhodium(I) complex with optically active phosphine ligands using various hydrosilanes. A mechanism of the induction of asymmetry is proposed in view of the stereochemicalcourse of the reaction.
Cationic Ru–Se Complexes for Cooperative Si–H Bond Activation
作者:Marvin Oberling、Elisabeth Irran、Yasuhiro Ohki、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1021/acs.organomet.0c00719
日期:2020.12.28
The preparation and structural characterization of mononuclear tethered ruthenium(II) complexes of type [(DmpSe)Ru(PR3)]+BArF4– (DmpSe = 2,6-dimesitylphenyl selenolate, ArF = 3,5-bis(trifluoromethyl)phenyl) are described. Unlike relevant known selenolate complexes, the reported family of complexes is cationic with a single monodentate selenolate ligand. The ability of these complexes to engage in cooperative
[(DmpSe)Ru(PR 3)] + BAr F 4 –(DmpSe = 2,6-二苯二甲硒基苯硒酸酯,Ar F的类型的单核束缚钌(II)配合物的制备和结构表征描述了= 3,5-双(三氟甲基)苯基。与已知的相关硒酸盐络合物不同,所报道的络合物家族是具有单个单齿硒酸盐配体的阳离子。研究了这些络合物在Ru-Se键上参与Si-H键协同活化的能力,并通过多核NMR光谱和X射线衍射对氢化硅烷加合物进行了充分表征。评估了这些配合物作为各种离子脱氢甲硅烷基化和氢化硅烷化反应的催化剂的有用性。在所有阶段,将新的配合物与其硫醇盐同系物[(DmpS)Ru(PR 3)] + BAr F 4 –(DmpS = 2,6-二甲磺基苯硫醇酯)。硒酸酯和硫醇酸酯配合物之间的差异很小,但是可以测量。较大的硒原子在Ru-Se键周围提供的空间比硫在Ru-S键处提供的空间更大,因此,硒酸酯络合物可以容纳空间上要求更高的氢硅烷。