Induced Acceleration of Phosphine Exchange in Metal Carbonyls by Pendant Groups of Coordinated Polyphosphines. Two Dangling Phosphine Arms Are Much Better Than One<sup>1</sup>
作者:Richard L. Keiter、John William Benson、Ellen A. Keiter、Weiying Lin、Zhongjiang Jia、Donna M. Olson、Douglas E. Brandt、Jeremy L. Wheeler
DOI:10.1021/om980289h
日期:1998.9.1
dangling phosphines is faster than chelation for each of the four complexes, but chelation of 1 or 2 is much faster than chelation of 3 or 4. It appears that the second danglingphosphine arm present in 1 and 2 accelerates the exchange of all metal-attached ligands. Also observed is long-range phosphorus−carbon coupling, possibly enhanced by a “through-space” interaction, between the short-armed dangling
[EN] SYSTEM PROVIDING CONTROLLED DELIVERY OF GASEOUS CO FOR CARBONYLATION REACTIONS<br/>[FR] SYSTÈME PERMETTANT LA LIBÉRATION CONTRÔLÉE DE CO GAZEUX POUR RÉACTIONS DE CARBONYLATION
申请人:UNIV AARHUS
公开号:WO2012079583A1
公开(公告)日:2012-06-21
A carbonylation system comprising at least one carbon monoxide producing chamber and at least one carbon monoxide consuming chamber forming an interconnected multi-chamber system, said interconnection allowing carbon monoxide to pass from the at least one carbon monoxide producing chamber to the at least one carbon monoxide consuming chamber, said at least one carbon monoxide producing chamber containing a reaction mixture comprising a carbon monoxide precursor and a catalyst, said at least one carbon monoxide consuming chamber being suitable for carbonylation reactions, said interconnected multi- chamber system being sealable from the surrounding atmosphere during carbonylation.
Structural Aspects, IR Study, and Molecular Photophysics of the Cumulene-Bridged Complexes with Rhenium(I), Ruthenium(II), and Osmium(II) Centers
作者:Jeffrey V. Ortega、Kay Khin、Wytze E. van der Veer、Joseph Ziller、Bo Hong
DOI:10.1021/ic0006910
日期:2000.12.1
all mono-, homo-, and heterobimetallic complexes is achieved using 31P(1H) NMR, IR, and fast atom bombardment mass spectroscopy (FAB/MS) and elemental analysis. The two ReI homobimetallic complexes were also characterized by single-crystal X-raystructuredetermination, which provided the structural evidence of a 90 degrees rotation between the C3 and C4 adducts causing a change in the electrochemical
Ph2PC(CH2)PPh2 = C(H)C(O)C6H4-p-NO2 (Y), derived from 1,1-bis(diphenylphosphino)ethylene (dppee). These complexes have been prepared through reactions between (Y) and [MCl2(cod)] (M = Pd (C1) or Pt (C2); cod = 1,5-cyclooctadiene) in equimolar ratio in the hope of finding new compounds that may be useful in stereoselective catalysis and find use as antitumor metallodrugs. Characterization of these compounds was
该描述描述了我们最近对与不对称phospho叶立德的Phallada和platinaphosphacycle配合物Ph 2 PC(CH 2)PPh 2 = C(H)C(O)C 6 H 4 - p -NO 2(Y)的研究由1,1-双(二苯基膦基)乙烯(dppee)制得。这些配合物是通过(Y)与[MCl 2(cod)](M = Pd(C 1)或Pt(C 2); cod = 1,5-环辛二烯)等摩尔比,希望找到可用于立体选择性催化的新化合物,并用作抗肿瘤金属药物。这些化合物的表征通过元素分析,IR,1 H,13 C和31 P NMR光谱法进行。通过单晶X射线结构分析确定了Pd和Pt配合物的结构,表明这两种配合物均由由叶立德磷配位形成的五元环组成(Y)通过膦基和亚丙基碳原子到达金属中心。使用Mizoroki-Heck和Suzuki-Miyaura交叉偶联反应对复合物的催化活性进行了评估和比较。此
Transition-metal chemical shifts in complexes of molybdenum(0) and tungsten(0)
作者:Geoffrey T. Andrews、Ian J. Colquhoun、William McFarlane、Samuel O. Grim
DOI:10.1039/dt9820002353
日期:——
methods respectively for 65 related derivatives of [Mo(CO)6] and [W(CO)6] with (mainly) phosphorus ligands. The chemical shifts of the two nuclei are remarkably parallel, those for l83W being ca. 1.7 times more sensitive to changes in chemical environment than those for 95Mo. The chemical shifts are temperature-dependent, and trends in them can be largely accounted for by variations in the mean electronic