σ-Bond Metathesis between M–X and RC(O)X′ (M = Pt, Pd; X, X′ = Cl, Br, I): Facile Determination of the Relative Δ<i>G</i> Values of the Oxidative Additions of RC(O)X to an M(0) Complex, Evidence by Density Functional Theory Calculations, and Synthetic Applications
those obtained by density functional theory (DFT) calculations. Activation parameters obtained by experiments as well as a systematic DFT study supported the fact that reactions occurred through slightly distorted quadrangular pentacoordinated σ-bond metatheses, in which the Clatom underwent a more indirect course than the Br atom. Moreover, exchangereactions were employed as the accessible prototype
描述了MX与RC(O)X'之间的配体交换反应的新效用(X,X'=卤素; R =芳基,烷基)。相对Δ ģ S(ΔΔ ģ多个)的酰卤的氧化的增加RC(O)X,以M(PPH 3)2大号Ñ(M =铂,钯),使用的X之间的卤素交换反应,测定反-M(X)[C(O)R](PPh 3)2和RC(O)X'的X'。实验热力学数据与通过密度泛函理论(DFT)计算获得的数据合理地一致。通过实验以及系统的DFT研究获得的激活参数支持以下事实:反应是通过略微扭曲的四边形五配位σ键易位反应发生的,其中Cl原子比Br原子经历的过程更间接。此外,交换反应被用作将三元镍配合物的卤素配体转化为较重的卤素配体的可接近的原型。
Trifluoromethyl Group 2<scp>B</scp>compounds: formation of mono- and bis-(trifluoromethyl)–platinum, –palladium, and –nickel trialkylphosphine complexes from the reaction of (CF<sub>3</sub>)<sub>2</sub>Cd·glyme [glyme =(CH<sub>2</sub>OMe)<sub>2</sub>] with the diligand metal dihalides
作者:Larry J. Krause、John A. Morrison
DOI:10.1039/c39810001282
日期:——
The reaction of (CF3)2Cd·glyme [glyme =(CH2OMe)2] with bis(trialkylphosphine) Group 8B dihalides like Br2Ni(PEt3)2 during short periods of time, 0·5–5 h, results in the formation of the monosubstituted compounds (CF3)BrNi(PEt3)2, (CF3)BrPd(PEt3)2, and (CF3)IPt(PBun3)2 in 60–70% yield; over longer periods of time, in the presence of an excess of (CF3)2Cd·glyme, the disubstituted compounds, (CF3)2M(PEt3)2(M
Transition-metal–carbon bonds. Part 43. Some long-chain and large-ring complexes of nickel, palladium, or platinum with tetramethylene- and hexamethylene-dioxydiphenyl
作者:Lynne C. Sawkins、Bernard L. Shaw、Brian L. Turtle
DOI:10.1039/dt9760002053
日期:——
unidentified product. Corresponding complexes of platinum are not formed : instead binuclear species of the type [Y2XPt(C6H4O[CH2]nOC6H4) PtY2X](X = Br or I) are obtained (Y = PEt2Ph, PMe2But, or AsMe2But). The dibromo-complexes [(ButMe2P)2XPt(C6H4O[CH2]nOC6H4)PtX(PMe2But)2](X = Br) react with Na[BH4] to give the corresponding dihydrides (X = H). Palladiumcomplexes of the type [(Et3P)2XPd(C6H4O[CH2
二溴醚1,4-双(邻溴苯氧基)丁烷和1,6-双(邻溴苯氧基)己酮通过正丁基锂二卤化(卤素-金属交换)。二硫代衍生物LiC 6 H 4 O [CH 2 ] 4 OC 6 H 4 Li(Li 2 L)与反式-[NiBr 2 Y 2 ](Y = PEt 2 Ph或PEt 3)反应生成黄色[NiLY 2 ],其中L充当反式结合的双齿螯合物,给出11元环。相反,LiC 6 H 4 O [CH2 ] 6 OC 6 H 4 Li(Li 2 L')给出绿色未鉴定产物。没有形成相应的铂络合物:取而代之的是[Y 2 XPt(C 6 H 4 O [CH 2 ] n OC 6 H 4)PtY 2 X](X = Br或I)型双核物质(Y = PET 2 PH,PME 2卜吨,或ASME 2卜吨)。的二溴络合物[(卜吨我2 P) 2 XPT(C6 ħ 4 -O [CH 2 ] Ñ OC 6 H ^ 4)PTX(PME
Activation of Aromatic Carbon–Hydrogen Bonds by Palladium(II) Acetate–Dialkyl Sulfide Systems. Formation and Characterization of Novel Diphenyltripalladium(II) Complexes
Palladium(II) acetate reacts with benzene in the presence of dialkyl sulfides at 70 °C to afford novel diphenyltripalladium(II) complexes of [(R1SR2)PhPd(μ-MeCO2)2Pd(μ-MeCO2)2PdPh(R1SR2)] (1a; R1=But, R2=CH2But: 1b; R1=R2=Bui: 1c; R1=R2=Pri: 1d; R1=R2=Et). Adducts, [Pd(MeCO2)2(ButSCH2But)2] and [Pd(MeCO2)2(SPri2)2], prepared by the reactions of palladium(II) acetate and the corresponding dialkyl sulfides
在 70 °C 下,乙酸钯 (II) 与苯在二烷基硫化物存在下反应,得到 [(R1SR2)PhPd(μ-MeCO2)2Pd(μ-MeCO2)2PdPh(R1SR2)] (1a) 的新型二苯基三钯 (II) 配合物;R1=But,R2=CH2But:1b;R1=R2=Bui:1c;R1=R2=Pri:1d;R1=R2=Et)。加合物,[Pd(MeCO2)2(ButSCH2But)2] 和 [Pd(MeCO2)2(SPri2)2],由乙酸钯 (II) 和相应的二烷基硫化物在 5-10 °C 下在苯中反应制备,在苯中加热至 70 °C 时分别变为 1a 和 1c。相比之下,乙酸钯 (II) 与甲苯或噻吩在二异丙基硫化物存在下的反应没有提供可分离的甲苯基或噻吩基钯物质,但通过 GLC 分析检测到偶联产物,即二甲苯基或二噻吩基。用苯乙烯处理 1b 产生反式二苯乙烯,而 1c 与一氧化碳和二氧化碳反应生成苯甲酸。当乙酸钯
Studies of exchange equilibria of palladium(II) tertiary phosphine complexes
作者:W.J. Louch、D.R. Eaton
DOI:10.1016/s0020-1693(00)89044-1
日期:1978.1
reactions of tertiaryphosphinecomplexes of Pd(II) with phosphine !igand: have been investigated by NMR and conductivity measurements. Depending on the nature of the phosphineligand either ligand exchange or the formation of cationic complexes can occur. Relative equilibrium constants for these reactions have been obtained. NMR line broadening experiments have enabled the relative rates of ligand exchange