Rethinking Basic Concepts—Hydrogenation of Alkenes Catalyzed by Bench-Stable Alkyl Mn(I) Complexes
作者:Stefan Weber、Berthold Stöger、Luis F. Veiros、Karl Kirchner
DOI:10.1021/acscatal.9b03963
日期:2019.11.1
intermediate which undergoes rapid hydrogenolysis to form the active 16e Mn(I) hydride catalyst [Mn(dippe)(CO)2(H)]. A range of mono- and disubstituted alkenes were efficiently converted into alkanes in good to excellent yields. The hydrogenation of 1-alkenes and 1,1-disubstituted alkenes proceeds at 25 °C, while 1,2-disubstituted alkenes require a reaction temperature of 60 °C. In all cases, a catalyst loading
Ligands for metals and improved metal-catalyzed processes based thereon
申请人:——
公开号:US20040171833A1
公开(公告)日:2004-09-02
One aspect of the present invention relates to ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.
Octaboraneyl Complexes of Nickel: Monomers for Redox‐Active Coordination Polymers
作者:Marcus W. Drover、Maeve C. Dufour、Lindsay A. Lesperance‐Nantau、Rayni P. Noriega、Kirill Levin、Robert W. Schurko
DOI:10.1002/chem.202001218
日期:2020.9
polymer is obtained. Characterization of this material by solid‐state NMR and EPR spectroscopy reveals the presence of a charge‐transfer polymer, which forms as a function of intramolecular Ni→4,4′‐bpy electron transfer (ET), providing an array of oxidizednickelsites and reduced 4,4′‐bpy radical anion sites. Notably, the related intermolecular reaction between the model fragments [Ni(dnppe)2] (dnppe=1
在这里,我们建立了一种新的二膦配体1,2-双(di(3-(di-3-dicyclohexylboraneyl)丙基膦基)乙烷(P 2 B Cy 4)的制备,表征和反应性,该支架包含四个侧链硼烷。通过使用镍建立了八硼烷酰基络合物[Ni(P 2 B Cy 4)2,从而确立了进入P 2 B Cy 4配位化学的途径。]-该物种包含一个富硼的次级配位球,该球易与Lewis碱反应。对于4,4'-联吡啶,可获得对空气敏感的配位聚合物。通过固态NMR和EPR光谱对该材料进行表征,揭示了电荷转移聚合物的存在,该电荷转移聚合物的形成是分子内Ni→4,4'-bpy电子转移(ET)的功能,提供了一系列氧化镍位点并减少了4,4'-bpy自由基阴离子位点。值得注意的是,模型片段[Ni(d n ppe)2 ](d n ppe = 1,2-双(二-正丙基膦基)乙烷)和双(硼烷)保护的4,4'之间的相关分子间反应‐bpy,不提供ET。总体而言,P
Old Concepts, New Application – Additive‐Free Hydrogenation of Nitriles Catalyzed by an Air Stable Alkyl Mn(I) Complex
作者:Stefan Weber、Luis F. Veiros、Karl Kirchner
DOI:10.1002/adsc.201901040
日期:2019.12.3
additive-free manganese-catalyzed hydrogenation of nitriles to primary amines with molecular hydrogen is described. The pre-catalyst, a well-defined bench-stable alkyl bisphosphine Mn(I) complex fac-[Mn(dpre)(CO)3(CH3)] (dpre=1,2-bis(di-n-propylphosphino)ethane), undergoes CO migratory insertion into the manganese-alkyl bond to form acyl complexes which upon hydrogenolysis yields the active coordinatively
SULFUR OXOACID-SUBSTITUTED AND PHOSPHORUS OXOACID-SUBSTITUTED POLYAROMATIC RESINS AND SALTS THEREOF AS PROMOTERS IN ACRYLATE PRODUCTION FROM COUPLING REACTIONS OF OLEFINS AND CARBON DIOXIDE
申请人:CHEVRON PHILLIPS CHEMICAL COMPANY LP
公开号:US20180362434A1
公开(公告)日:2018-12-20
This disclosure provides for routes of synthesis of α,β-unsaturated carboxylic acids and their salts, including acrylic acid. For example, disclosed is a process for producing an α,β-unsaturated carboxylic acid or its salt, comprising: (1) contacting a group 8-11 transition metal precursor, an olefin, carbon dioxide, a diluent, and a sulfur oxoacid anion-substituted polyaromatic resin or a phosphorus oxoacid anion-substituted polyaromatic resin with associated metal cations to provide a mixture; and (2) applying reaction conditions to the mixture suitable to produce the α,β-unsaturated carboxylic acid or a salt thereof. Methods of regenerating the polyaromatic resin with associated metal cations are described.