[(18-C-6)K][(N≡C)Cu<sup>I</sup>–SiMe<sub>2</sub>Ph], a Potassium Silylcyanocuprate as a Catalyst Model for Silylation Reactions with Silylboranes: Syntheses, Structures, and Catalytic Properties
作者:Jacqueline Plotzitzka、Christian Kleeberg
DOI:10.1021/acs.inorgchem.7b00749
日期:2017.6.5
extension allows the efficient silylation of ketones. In addition, a number of peculiarities of the catalytic reaction are readily rationalized on the basis of the mechanistic insight already established using [(NHC)Cu–SiMe2Ph] as a model catalyst. Analogously to the NHC model system, the reaction of 2 with the silylborane 1 furnishes the silylcyanocuprate [(18-C-6)K][NC–Cu–SiMe2Ph] (3) as a potential crucial
Cu I催化的甲硅烷基硼烷(特别是pinB–SiMe 2 Ph(1))作为甲硅烷基来源的甲硅烷基化反应最近受到了广泛的关注。CuCN / NaOMe是最有效,用途最多且最简单的催化剂体系之一。然而,对于催化相关的物种一无所知。使用基于NHC的模型催化剂,已确定类型[(NHC)Cu-SiMe 2 Ph]的铜甲硅烷基络合物是这些催化过程中的关键物种。定义明确且具有光谱学和结构特征的复合物[(18-C-6)K] [NC–Cu–O t Bu](2),作为催化系统的模型,CuCN / NaOMe对既定的示例性底物(醛,亚胺,α,β-不饱和羰基)表现出可比的催化活性,并且可以使酮有效地甲硅烷基化。另外,基于已经使用[(NHC)Cu-SiMe 2 Ph]作为模型催化剂建立的机理洞察力,很容易合理化催化反应的许多特殊性。与NHC模型系统类似,2与甲硅烷基硼烷1的反应提供了甲硅烷基氰基丙酸酯[(18-C-6)K]
Terminal versus Bridging Boryl Coordination in N-Heterocyclic Carbene Copper(I) Boryl Complexes: Syntheses, Structures, and Dynamic Behavior
作者:Wiebke Drescher、Christian Kleeberg
DOI:10.1021/acs.inorgchem.9b01041
日期:2019.6.17
the linear boryl complex [(SIDipp)Cu−Bcat] from PhMe or the μ-boryl complex [((SIDipp)Cu)2Bcat][cat2B] from THF. The relevant conversion of the linear boryl complex to the μ-boryl complex occurs in the polar solvent via formal boryl anion abstraction by the Lewis acid catB–OtBu, concomitantly formed during the B–B activation. With Lewis acids such as BPh3 or [CPh3][BArF] (reversible), boryl abstraction
On the Reactivity of Silylboranes toward Lewis Bases: Heterolytic B–Si Cleavage vs. Adduct Formation
作者:Christian Kleeberg、Corinna Borner
DOI:10.1002/ejic.201300119
日期:2013.5.14
reactions also frequently require the presence of Lewis basic alkali metal alkoxides. In the present study we explore the reaction of K(18-crown-6) tert-butoxide and the NHC 1,3-diisopropyl-4,5-dimethyl-imidazol-2-ylidene as exemplary Lewis bases with the two silylboranes pinB-SiMe2Ph and pinB-SiPh3 (pin = OCMe2CMe2O). The reaction with K(18-crown-6) tert-butoxide results in activation of the boron–silicon
Selective Synthesis of Unsymmetrical Diboryl Pt
<sup>II</sup>
and Diaminoboryl Cu
<sup>I</sup>
Complexes by B–B Activation of Unsymmetrical Diboranes(4) {pinB–B[(NR)
<sub>2</sub>
C
<sub>6</sub>
H
<sub>4</sub>
]}
作者:Corinna Borner、Christian Kleeberg
DOI:10.1002/ejic.201402234
日期:2014.5
limited. Unsymmetrical diborane(4) derivatives comprising a dialkoxy- and a diaminoboron moiety provide efficient access to diaminoboryl complexes either by oxidative addition or by σ-bond metathesis reactions. Especially, the latter is complementary to existing methods and overcomes the existing limitations. This is illustrated by the modular synthesis of four unsymmetrical diborane(4) derivatives and their