SiSi and SiO Bond Activation at Platinum: Stepwise Formation of a SiH<sub>3</sub>Complex
作者:Cathérine Mitzenheim、Thomas Braun
DOI:10.1002/anie.201302459
日期:2013.8.12
[Pt(H)2(dcpe)] (dcpe=1,2‐bis(dicyclohexylphosphino)ethane) with stoichiometric amounts of silane leads to the bis(silyl) complex [PtSi(OMe)3}2(dcpe)], whereas the use of an excess silane results in hydrodealkoxylations by repetitive SiObondactivation and the formation of SiH3 ligands (see scheme; Cy=cyclohexyl).
Si–H and Si–Si activation at Pt: synthesis and reactivity of neutral and cationic silyl complexes
作者:Jan Voigt、Thomas Braun
DOI:10.1039/c1dt11351h
日期:——
Reactions of [Pt(PEt3)3] (1) with the silanes HSiPh3, HSiPh2Me and HSi(OEt)3 led to the products of oxidative addition, cis-[Pt(H)(SiPh3)(PEt3)2] (2), cis-[Pt(H)(SiPh2Me)(PEt3)2] (3), cis-[Pt(H)Si(OEt)3}(PEt3)2] (cis-4) and trans-[Pt(H)Si(OEt)3}(PEt3)2] (trans-4). The complexes cis-4 and trans-4 can also be generated by hydrogenolysis of (EtO)3SiSi(OEt)3 in the presence of 1. Furthermore, the silyl compounds cis-4 and trans-4 react with B(C6F5)3 and CH3CN by hydride abstraction to give the cationic silyl complex trans-[PtSi(OEt)3}(NCCH3)(PEt3)2][HB(C6F5)3] (8). In addition, the reactivity of the complexes cis-4, trans-4 and 8 towards alkenes and CO was studied using NMR experiments.
1) Hexamethoxy-, hexaethoxy- and hexaisopropoxy-disilane were prepared and characterized.2) Dehydrochlorination at an elevated temperature was not suitable for the preparation.3) A trace of chlorine compound contaminated in the product could be completely taken off by dry ammonia or pyridine.4) Alkoxydisilanes could not be prepared by using pyridine throughout the reaction as an acid acceptor.5) The volume of hydrogen evolved by the fission of alkoxydisilanes varied with the reagents.
Cobalt(I)-Catalyzed Transformation of Si–H Bonds: H/D Exchange in Hydrosilanes and Hydrosilylation of Olefins
作者:Lars Denker、Daniela Wullschläger、Juan Pablo Martínez、Stanisław Świerczewski、Bartosz Trzaskowski、Matthias Tamm、René Frank
DOI:10.1021/acscatal.2c06259
日期:2023.2.17
1,2-(DippNH)–C6H4–N═C(NiPrCMe)2] is employed in the synthesis of the paramagnetic cobalt(I) arene complex Co(AmIm)(η6-C6H6). The latter was found to be a highly efficient (pre)catalyst in H/D exchange reactions with deuterium (D2) in hydrosilanes. The scope comprises primary to tertiary silanes at a low catalyst loading of 1 mol %. Additionally, the same cobalt(I) arene complex was able to catalyze
Iron(I) and Iron(II) Amido-imidazolin-2-imine Complexes as Catalysts for H/D Exchange in Hydrosilanes
作者:Noor U Din Reshi、Dirk Bockfeld、Dirk Baabe、Lars Denker、Juan Pablo Martínez、Bartosz Trzaskowski、René Frank、Matthias Tamm
DOI:10.1021/acscatal.3c05355
日期:2024.2.2
The unsymmetrical amino-imidazolin-2-imine ligand [HAmIm, 1,2-(DippNH)–C6H4–N=C(NiPrCMe)2] is employed in the synthesis of the iron(I) arene complex [(AmIm)Fe(η6-C6H6)] and the iron(II) neosilyl complex [(AmIm)Fe(CH2SiMe3)]. These compounds are highly efficient precatalysts in H/D exchange reactions with deuterium (D2) in hydrosilanes. The scope comprises primary to tertiary silanes at a catalyst loading