The cationic ruthenium half-sandwich complex [Cp*Ru(PPh3)(2)(CH3CN)][OTf] (2) (CP* = eta(5)-C5Me5, OTf = SO3CF3) was synthesized by reduction of [Cp*RuCl2](2) with zinc in the presence of NaOTf and subsequent reaction with PPh3. When NaOTf was omitted, the corresponding tetrachlorozincate salts were obtained. Complex2, as well as the salts [Cp*Ru(CH3CN)(3)](2)[ZnCl4] (3) and [Cp*Ru(PPh3)(2)(-)(CH3CN)](2)[ZnCl4]
Synthesis, characterization, X-ray crystallography analysis, and catalytic activity of bis(2-pyridylmethyl)amine copper complexes containing coupled pendent olefinic arms in atom transfer radical addition (ATRA) reactions
作者:Katherine A. Bussey、Annie R. Cavalier、Margaret E. Mraz、Kayode D. Oshin、Amy Sarjeant、Tomislav Pintauer
DOI:10.1016/j.poly.2015.12.043
日期:2016.8
C group in the olefinic arm of a neighboring complex. This interaction led to augmentation of the C C bond due to back-bonding from the metal center. Five solid state structures were obtained for the copper(II) complexes with two also displaying intermolecular associative bonding between olefinic pendent arms and the metal center. X-ray crystallography studies showed that the olefinic arm motifs incorporated
An Efficient, Selective, and Reducing Agent-Free Copper Catalyst for the Atom-Transfer Radical Addition of Halo Compounds to Activated Olefins
作者:José María Muñoz-Molina、Tomás R. Belderraín、Pedro J. Pérez
DOI:10.1021/ic901942p
日期:2010.1.18
Efficient and selective ATRA reactions of CCl4, CBr4, TsCl (Ts = tosyl), or Cl3CCO2Et with activatedolefins (styrene, methyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate) using the TptBuCu(NCMe) complex as a catalyst have been achieved in the absence of any reductant and with low catalyst loadings.
quasi-reversible waves were observed for the Ru2+/Ru3+ redox couples with E1/2 values ranging between 0.65 and 0.80 V vs. Ag/AgCl. The activity of chelates 1–9 was probed in three catalytic processes, viz., the synthesis of vinyl esters from benzoic acid and 1-hexyne, the cyclopropanation of styrene with ethyl diazoacetate, and the atom transfer radical addition of carbon tetrachloride and methyl methacrylate. In
[RuCl 2(p- cymene)] 2与O-乙基黄药酸钾和一组九种代表性的Ph 2 P–X–PPh 2二齿膦(dppm,dppe,dppp,dppb,dpppe,dppen,dppbz,dppff)的反应和DPEphos)提供了单金属[Ru(S 2 COEt)2(diphos)]螯合物1–9产率为62–96%。通过使用各种分析技术对所有产物进行了充分表征,并通过X射线晶体学确定了它们的分子结构。它们具有高度扭曲的八面体几何形状,S–Ru–S咬合角接近72°,P–Ru–P咬合角介于73°和103°之间。记录的阴离子黄药配体的键长和IR拉伸频率强烈表明EtO + CS 2 2-共振形式的重要贡献。1 H NMR和XRD分析表明,乙基的亚甲基质子是非对映异构的,这是由于它们的构象被相邻的苯环强烈锁定。在循环伏安法上,观察到Ru 2+ / Ru的准可逆波3+氧化还原对, E 1/2值相对于Ag
Assessment of Catalysis by Arene‐Ruthenium Complexes Containing Phosphane or NHC Groups bearing Pendant Conjugated Diene Systems
Two p-cymene-ruthenium complexes 1 and 2 were isolated in high yields by treating the [RuCl2(p-cymene)]2 dimer with new hybrid phosphane- or NHC-linked diene ligands. Both complexes were fully characterized by NMR spectroscopy, and the molecular structure of the ruthenium–p-cymene complex 1, containing the phosphane–diene ligand system, was determined by X-ray diffraction analysis. The catalytic activities