Combinatorial Approach to the Catalytic Hydrosilylation of Styrene Derivatives: Catalyst Systems Composed of Organoiron(0) or (II) Precursors and Isocyanides
(COT)2Fe and the open ferrocenes (MPDE)2Fe (MPDE = η5-3-methylpentadienyl) and (DMPDE)2Fe (DMPDE = η5-2,4-dimethylpentadienyl) were found to function as catalyst precursors for the hydrosilylation of alkenes in the presence of auxiliary ligands. Screening trials determined that the optimal catalyst system was composed of (COT)2Fe and adamantyl isocyanide, allowing the selective hydrosilylation of styrene
A Free-Radical-Promoted Stereospecific Decarboxylative Silylation of α,β-Unsaturated Acids with Silanes
作者:Lizhi Zhang、Zhaojia Hang、Zhong-Quan Liu
DOI:10.1002/anie.201509537
日期:2016.1.4
acrylic and propiolic acids with silanes was developed. This reaction represents the first example of decarboxylative CSi bond formation and provides an efficient and convenient approach to various synthetically useful alkenyl and alkynyl organosilicon compounds through the reaction of α,β‐unsaturated acids with silanes. Spin‐trapping and EPR experiments support a radicaladdition/elimination process
potential of oxide-supported single-atom metal catalysts (SACs) is key to successfully bridge the gap between the fields of homogeneous and heterogeneous catalysis. Here we show that the one-pot combination of Ru1 /CeO2 and Rh1 /CeO2 SACs enables a highly selective olefin isomerization-hydrosilylation tandem process, hitherto restricted to molecular catalysts in solution. Individually, monoatomic Ru and
Cyclic metal(oid) clusters control platinum-catalysed hydrosilylation reactions: from soluble to zeolite and MOF catalysts
作者:Miguel Rivero-Crespo、Judit Oliver-Meseguer、Klaudia Kapłońska、Piotr Kuśtrowski、Emilio Pardo、José Pedro Cerón-Carrasco、Antonio Leyva-Pérez
DOI:10.1039/d0sc02391d
日期:——
alkynes, carbonyls and alcohols, i.e. the hydrosilylationreaction, is a fundamental transformation in industrial and academic chemistry, often claimed as the most important application of Pt catalysts in solution. However, the exact nature of the Pt active species and its mechanism of action is not well understood yet, particularly regarding regioselectivity. Here, experimental and computational studies
Hydrometallatrane-catalyzed regioselective hydrosilylation of styrene and phenylacetylene
作者:S. N. Adamovich、R. G. Mirskov、A. N. Mirskova
DOI:10.1007/s11172-015-1153-6
日期:2015.9
azolium complexes leads to a mixture of and ad ducts.18—20 The products of further hydrosilylation of the double bonds in the adducts 1—3 were not formed under these conditions. Hydrosilanes undergo the addition to styrene in the presence of [nN(CH2CH2OH)3Rh] 3+•3Cl– (n = 1, 2). The reaction proceeds regioselectively with the forma tion of terminal adducts 4—6 (18—34% yield). The most efficient catalyst
三乙醇胺与金属盐 (MXp) 的离子络合物,通式 [nN(CH2CH2OH)3M] p+•pХ– (M = Mn, Co, Ni, Fe; X = Cl, OAc; n = 1, 2; p = 2, 3),类似于silatranes1具有环状“atrane”结构和分子内配位N→M键。然而,与 silatranes 相比,它们包含配位 HO→M 键,2-15 而不是共价 O-Si 键。我们表明,HMA 与 sila tranes 一样,表现出很高的生理活性。因此,HMA,其中 M = Mg、Fe、Co、Ni、Cu、Rh,具有免疫活性,8 而当 M = Zn 时,它们表现出抗血管生成和抗硬化作用。 12,13,15 最近,M = Ni、Co 被建议用作从水中光催化制备氢气的助催化剂,16 而对于 M = Cu — 作为芳基卤化物羟基化的催化剂。17 在目前的工作中,我们首次研究了 HMA [nN(CH2CH2OH)mM]