Fundamental Differences between Group 8 Metals: Unexpected Oxidation State Preferences and Mechanisms in Ruthenium Borylene Complex Formation
作者:Holger Braunschweig、Alexander Damme、Rian D. Dewhurst、Krzysztof Radacki、Felix Weißenberger、Benedikt Wennemann、Qing Ye
DOI:10.1002/chem.201601602
日期:2016.6.13
Cl2BDur (Dur=2,3,5,6‐Me4C6H) leads to both boryl and borylenecomplexes of divalent ruthenium, the former through simple salt elimination and the latter through subsequent CO loss and 1,2‐halide shift. The balance of products can be altered by varying the reaction conditions; boryl complexes can be favored by the addition of CO, and borylenecomplexes by removal of CO under vacuum. All of these products
Osmium anionic complexes, K[(PMe3)Os(CO)3(SiR3)] (R = Me, Et), were synthesized by deprotonation of the corresponding metal hydrides. The nucleophilicity of these compounds was demonstrated through the reaction of K[(PMe3)Os(CO)3(SiMe3)] with Cl2BDur and Br2BDur (Dur = 2,3,5,6-tetramethylphenyl) to give haloboryl complexes through a saltelimination process that is unprecedented for osmium–boron chemistry
<sup>Me</sup>
CAAC=N
<sup>−</sup>
: A Cyclic (Alkyl)(Amino)Carbene Imino Ligand
作者:James T. Goettel、Haopeng Gao、Simon Dotzauer、Holger Braunschweig
DOI:10.1002/chem.201904715
日期:2020.1.22
reaction of MeCAAC with trimethylsilyl azide afforded the N‐silylated 2‐iminopyrrolidine (MeCAAC=NSiMe3), which was fully characterized. This compound undergoes hydrolysis to afford the 2‐iminopyrrolidine and trimethylsiloxane which co‐crystallize as a hydrogen‐bonded adduct. The N‐silylated 2‐iminopyrrolidine was used to transfer the novel pyrrolidine‐2‐iminato ligand onto both main‐group and transition‐metal
2-diyl-bridged A-frame complexes [Pt2X2(μ-1,2-B2(NMe2)2)(μ-dmpm)2]. X-ray crystallographic studies of these (BY)n-bridged complexes show structural trends depending on the steric demands of Y and the nature of X. Analysis of higher-order 31P NMR satellites provided information on JP–Pt and JPt–Pt coupling constants, the latter correlating with the Pt⋯Pt distance. All (di)boranediyl complexes also proved unstable
一系列硼烷二基桥接的二铂A框架络合物[Pt 2 X 2(μ-BY)(μ-dmpm)2 ](X = Cl,Br,I; Y =芳基,烷基,氨基,卤素; dmpm =双(二甲基膦基)甲烷)是通过将BX 2 Y二次氧化加成到[Pt 2(nbe)2(μ-dmpm)2 ](nbe =降冰片烯)或桨轮络合物[Pt 2(μ-dmpm)中而合成的)3 ]。类似地,将B 2 X 2(NMe 2)2(X = Cl,Br)添加到[Pt 2(nbe)2(μ-dmpm)2]提供访问乙硼烷-1,2-二基桥连的A-帧络合物[PT 2 X 2(μ-1,2--B 2(NME 2)2)(μ-DMPM)2 ]。这些(BY)n桥联配合物的X射线晶体学研究表明,结构趋势取决于Y的空间需求和X的性质。对高阶31 P NMR卫星的分析提供了有关J P–Pt和J Pt–的信息。 Pt耦合常数,后者与Pt⋯Pt距离相关。还证明所有(二)硼烷二基配合物对桥接成功的“
N-Heterocyclic Silylenes in Boron Chemistry: Facile Formation of Silylboranes and Silaborinines
作者:Annika Gackstatter、Holger Braunschweig、Thomas Kupfer、Christian Voigt、Nicole Arnold
DOI:10.1002/chem.201603945
日期:2016.11.7
of a N‐heterocyclic silylene (NHSi) with PhBX2 (X=Cl, Br) readily afforded six‐membered silaborinines through an insertion/ring expansion sequence. Increasing the sterics of the borane from phenyl to duryl enabled the selective generation and isolation of the highly colored silylborane intermediates. Theoretical studies on the mechanism and energetics of the silaborinine formation were fully consistent