The kinetics of complexformationbetween palladium(II) acetate, and 1,1’-bis(diphenylphosphino)ferrocene, dppf, in two different deuterated solvents CDCl3 and DMSO-d6 were investigated using 31P NMR spectroscopy. The mole ratio and the 31P-chemical shifts in DMSO-d6 solution revealed the formation of an intermediate, which is gradually converted into the more stable [Pd(dppf)OAc)2] species with a
使用31 P NMR光谱研究了在两种不同的氘代溶剂CDCl 3和DMSO- d 6中乙酸钯(II)与1,1'-双(二苯基膦基)二茂铁dppf之间形成配合物的动力学。摩尔比和DMSO- d 6溶液中的31 P化学位移揭示了中间体的形成,该中间体逐渐转化为更稳定的[Pd(dppf)OAc)2 ]种类,其中dppf用作螯合配体。然而,在氯仿溶液中,金属离子与配体的相互作用直接导致了[Pd(dppf)OAc)2的形成。]种具有螯合的dppf。络合反应的速率常数通过相应积分时间数据的计算机拟合来评估。
Palladium(II) Complexes with 1,1‘−Bis(diphenylphosphino)ferrocenes [Fe(η<sup>5</sup>-C<sub>5</sub>R<sub>4</sub>PPh<sub>2</sub>)<sub>2</sub>]<i><sup>n</sup></i><sup>+</sup> (dppf, R = H, <i>n</i> = 0; dppomf, R = Me, <i>n</i> = 0; dppomf<sup>+</sup>, R = Me, <i>n</i> = 1). Synthesis, Characterization, and Catalytic Activity in Ethene Methoxycarbonylation
作者:Oleg V. Gusev、Alexander M. Kalsin、Mikhail G. Peterleitner、Pavel V. Petrovskii、Konstantin A. Lyssenko、Novruz G. Akhmedov、Claudio Bianchini、Andrea Meli、Werner Oberhauser
DOI:10.1021/om020300k
日期:2002.8.19
Several palladium(II) complexes with 1,1'-bis(diphenylphosphino)octamethylferrocene (dppomf) and its oxidized form 1,1'-bis(diphenylphosphino)octamethylferrocenium (dppomf(+)) have been synthesized and characterized by spectroscopic and electrochemical methods. For comparative purposes, analogous Pd(II) derivatives with 1,1'-bis(diphenylphosphino)ferrocene (dppf) have been also prepared. Single-crystal X-ray analyses have been carried out for the square-planar mononuclear compounds [Pd(H2O)(2)(dppf)](OTf)(2) and [Pd(H2O)(2)(dppomf)](OTf)(2) and for the binuclear complex [Pd(mu-OPF2O)(dppomf(+))](2)(BF4)(4)(.)6CH(2)Cl(2) in which two [Pd-(dppomf(+))](3+) moieties are held together by the oxygen atoms of two bridging PO2F2- groups derived from the oxidative degradation of PF6- ions, Selected dppf and dppomf Pd(II) complexes have been employed as catalyst precursors for the metboxycarbonylation of ethene (600 psi, 1:1 CO/C2H4, 85 degreesC). It has been found that dppomf generates selective catalysts for the production of methyl propanoate, while dppf leads to a variety of low-molecular-weight oxygenates spanning from methyl propanoate to alternating oligoketones.