Selective and efficient oxidation of ethylene to ethylene glycol acetates with H2O2 catalyzed by Pd(OAc)2–di(2-pyridyl)ketone–di(2-pyridyl)methanesulfonate system
作者:Julia R. Khusnutdinova、Laura L. Newman、Andrei N. Vedernikov
DOI:10.1016/j.jorganchem.2011.06.016
日期:2011.12
Novel systems for palladium-catalyzed selective oxidation of ethylene to a mixture of ethylene glycol mono- and di-acetates as the major reaction products (90–95% selectivity) with H2O2 in acetic acid solution at ambientpressure and 20 °C were developed. The catalytic reaction is very efficient with up to 90% combined yield of glycol acetates with H2O2 as a limiting reagent and 1 mol% catalyst loading
新型体系,用于钯催化的乙烯选择性氧化为乙二醇单乙酸和二乙酸酯的混合物,该混合物为主要反应产物(选择性为90-95%),在环境压力和20°C的乙酸溶液中具有H 2 O 2被开发。催化反应非常有效,乙酸乙二醇酯的合成产率高达90%,其中H 2 O 2作为限制试剂,催化剂负载量为1 mol%。所开发的催化体系由Pd(OAc)2和6-甲基取代的(2-吡啶基)甲磺酸盐和/或二(6-吡啶基)酮配体的混合物组成。二元Pd(OAc)2 –dpk,Pd(OAc)2 –Me-dpms和三元Pd(OAc)2的组成-Dpk-Me-dpms,已通过1 H NMR光谱和ESI质谱研究了系统。还进行了动力学研究,并提出了合理的反应机理,该机理以表面螯合配体使Pd II C 2 H 4 OAc中间体与H 2 O 2容易氧化,形成Pd IV C 2 H 4 OAc瞬态。
Mono- and polynuclear complexes from the reaction of palladium acetate with α-substituted thioethers and thiols
作者:Marino Basato、Diego Tommasi、Marco Zecca
DOI:10.1016/s0022-328x(98)00910-3
日期:1998.11
trimers decreases with the steric hindrance of the substituents at the sulphur and at the methine carbon atoms. Stable mixed sphere complexes are obtained also with carboxylato ligands different from acetato as PhCOO− and MeSCH2COO−. When the substituted thioether has poor electronwithdrawing groups, its reaction with palladium acetate affords complexes of the type [Pd(η1-OAc)2(RSCH2Z)2], in which the sulphur
Vinylic, allylic and homoallylic oxidations of alkenes via π- and σ-organopalladium complexes
作者:N.Yu. Kozitsyna、M.N. Vargaftik、I.I. Moiseev
DOI:10.1016/s0022-328x(99)00521-5
日期:2000.1
alkenes via intermediate organopalladiumcomplexes are discussed. The oxidation of propylene, hex-1-ene and cyclohexene by PdII acido complexescontaining achiral, racemic and chiral carboxylate ligands was first studied in a series of solvents other than acetic acid. Significant changes in the selectivity of the PdII-promoted reaction with changes in the solvent nature and ligand chirality were observed
One-pot synthesis of heterocyclic compounds through insertion of alkynes into the PdC bond of activated cyclopalladated benzyl methyl sulphide
作者:Jairton Dupont、Michel Pfeffer
DOI:10.1016/0022-328x(87)80336-4
日期:1987.2
chloride bridged-derivative, the cationic cyclopalladated compounds are more reactive towards the insertion of alkyne into their PdC σ bonds, which leads in some cases to cationic organic heterocycles containing either a six- or an eight-membered ring, arising from insertion of one or twoalkynemolecules, the CS bond being formed via reductive elimination of palladium(0).
Reactivity of polynuclear palladium carboxylate complexes towards acetonitrile: synthesis and X-ray study of Pd2(C6H4-o-C(NH)CH3)2(CH3CO2)2 and Pd5(CH3C(N)OC(N)CH3)(NO)(NO2)x(RCO2)7−x
作者:Oleg N. Shishilov、Nailya S. Akhmadullina、Yaroslavna N. Rezinkova、Roman E. Podobedov、Andrei V. Churakov、Inessa A. Efimenko
DOI:10.1039/c2dt32407e
日期:——
Reactions of the polynuclear palladium carboxylate complexes (binary palladium carboxylates and palladium nitrosyl carboxylates) with acetonitrile in some common organic solvents are described. It was found that reaction of palladium acetate Pd3(μ-CH3CO2)6 with acetonitrile and benzene leads to the formation of a binuclear complex Pd2(C6H4-o-C(NH)CH3)2(CH3CO2)2 containing molecules of orthometallated 1-phenylethanimine formed as a result of CâC-coupling of acetonitrile and benzene. Nitrosyl carboxylate complexes Pd4(NO)2(RCO2)6 promote more complicated transformations of acetonitrile that leads to the formation of coordinated acetimidic anhydride, which was found in Pd5(CH3C(N)OC(N)CH3)(NO)(NO2)x(RCO2)7âx clusters. Structures of all the complexes contained products of acetonitrile transformations and a new palladium nitrosyl carboxylate Pd4(NO)2(cyclo-C6H11CO2)6 was studied with XRD. Analysis of the structures allowed finding a âbuilding blockâ of palladium nitrosyl carboxylate clusters, that is a 4-nuclear metal chain âPd(μ-RCO2)2Pd(μ-NO)(μ-RCO2)Pd(μ-RCO2)2Pdâ.