Structural snapshots of concerted double E–H bond activation at a transition metal centre
作者:Joseph A. B. Abdalla、Alexa Caise、Christian P. Sindlinger、Rémi Tirfoin、Amber L. Thompson、Alison J. Edwards、Simon Aldridge
DOI:10.1038/nchem.2792
日期:2017.12.1
activation at a transitionmetal centre is a key fundamental step in numerous chemical transformations. The oxidative addition of element–hydrogen bonds, for example, represents a critical step in a range of widely applied catalytic processes. Despite this, experimentalstudies defining steps along the bond activation pathway are very rare. In this work, we report on fundamental studies defining a double
A Gallium Hydride as an Oxidizing Agent: Direct Synthesis of Ir<sup>V</sup>Complexes via Ga−H Bond Activation
作者:Alexa Caise、Joseph A. B. Abdalla、Rémi Tirfoin、Alison J. Edwards、Simon Aldridge
DOI:10.1002/chem.201704372
日期:2017.11.27
Reactions of the β‐diketiminate‐stabilized gallium dihydride (Nacnac)DippGaH2 with chelating IrI bis(phosphine) precursors under an H2 atmosphere are shown to provide a simple route to IrV complexes stabilized by strongly σ‐donating hydrides and the carbene‐like (Nacnac)DippGa donor. Characterization of these systems as seven‐coordinate IrV tetrahydride species is supported by single crystal X‐ray
Solvent‐Dependent Oxidative Addition and Reductive Elimination of H
<sub>2</sub>
Across a Gallium‐Zinc Bond
作者:Louis J. Morris、Thayalan Rajeshkumar、Akira Okumura、Laurent Maron、Jun Okuda
DOI:10.1002/anie.202208855
日期:2022.9.5
Dihydrogen reversibly adds across the Ga−Zn bond of a heterobimetallic cation. Oxidative addition is favoured in THF solution where the hydrogenation products are stabilized, but in fluorobenzene, reductive elimination of H2 is promoted by the Lewis-acidic zinc hydride cation.
A series of organometallic compounds of group 13 metals supported by the sterically encumbered beta-diketiminate ligand containing hydrides, fluorides, chlorides, and bromide have been synthesized and structurally characterized. The synthetic strategy applied utilizes halide metathesis and reduction of metal chlorides to the corresponding hydrides. Thus, the reaction of (LLiOEt2)-O-. with MeMCl2 affords LM(Me)Cl (M = Al (1), Ga (2), In (3)) and LGaBr2 (4) with GaBr3. Reduction of LGa(Me)Cl with (LiHBEt3)-B-. leads to the formation of LGa(Me)H (10). Synthesis of LGaH2 (12) has been accomplished by reacting LGal(2) (8) with (LiHBEt3)-B-.. LAl(Me)Cl (1) and LAlH2 (6) have been converted to LAl(Me)F (5) and LAlF2 (7), respectively. The former was obtained in a reaction of LAI(Me)Cl with Me3SnF while the latter was isolated in a reaction of LAlH2 with (BF3OEt2)-O-.. Similarly reaction of LGal(2) (8) with Me3SnF affords LGaF2 (9). Compounds reported herein have been characterized by elemental analyses, IR, NMR, El-MS, and single-crystal X-ray diffraction techniques.