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。
Metal Complexes with Very Large Dipole Moments: the Anionic Carborane Nitriles 12-NC–CB<sub>11</sub>X<sub>11</sub><sup>–</sup>(X = H, F, CH<sub>3</sub>) as Ligands on Pt(II) and Pd(II)
12-NC-1-H–CB11F10– were prepared, and three of them were examined for complex formation with (Et3P)2Pt(II) and (Et3P)2Pd(II). Several stable internally charge-compensated zwitterionic complexes were obtained and characterized. RI-BP86/SV(P) calculations suggest that their dipolemoments exceed 20 D. An attempt to measure the dipolemoments in solution failed due to insufficient solubility in solvents of
阴离子腈1-R-12-NC–CB 11 H 10 –(R = H,CH 3,I,COOH),12-NC-1-H–CB 11 Me 10 –和12-NC-1-制备了H–CB 11 F 10 –,并检查了其中的三个与(Et 3 P)2 Pt(II)和(Et 3 P)2 Pd(II)的络合物形成。获得并表征了几种稳定的内部电荷补偿的两性离子络合物。RI-BP86 / SV(P)计算表明,它们的偶极矩超过20D。由于在低极性溶剂中的溶解度不足,因此无法测量溶液中的偶极矩。
P-Alkynyl functionalized benzazaphospholes as transmetalating agents
作者:Daniel Y. Zhou、Preston M. Miura-Akagi、Sierra M. McCarty、Celeste H. Guiles、Timothy J. O'Donnell、Wesley Y. Yoshida、Colleen E. Krause、Arnold L. Rheingold、Russell P. Hughes、Matthew F. Cain
DOI:10.1039/d0dt01367f
日期:——
(F)), 5, which is the result of ligand exchange between P–I byproduct 4 and C/D, and the reductively eliminated product (Ar–CC–Ph). Cyclic voltammetry studies showed and independent investigations confirmed 4 is also susceptible to redoxprocesses including bimetallic oxidative addition to Pd(0) to give Pd(I) dimer 6-Pd2-(P(t-Bu)3)2 and reduction to diphosphine 7. During catalysis, we hypothesized
将 10π-电子苯并磷杂磷1暴露于 HCl,然后用格氏试剂 BrMgCCPh 进行亲核取代,得到具有外环 –C 的炔基官能化3 C-Ph 基团具有延长的 P-C 键 (1.7932(19) Å)。化学计量实验表明,用3处理反式-Pd(PEt 3 ) 2 (Ar)()(Ar = p -Me( C )或p -F( D ))生成反式-Pd(PEt 3 ) 2 (Ar) (CCPh) (Ar = p -Me ( E ) 或p -F ( F )), 5 ,这是 P–I 副产物4和C/D之间配体交换的结果,以及还原消除的产物 (Ar–C C-Ph)。循环伏安法研究表明,独立研究证实4也容易受到氧化还原过程的影响,包括双金属氧化加成到 Pd(0) 上,得到 Pd() 二聚体6-Pd 2 -(P( t -Bu) 3 ) 2和还原成二膦7 。在催化过程中,我们假设可以通过使用氟化物源作为添加剂来避免这种不需要的反应性。
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
Two components self-assembly of a Pd4 neutral molecular rectangle driven by Pd–O bond coordination has been achieved and this π-electron rich rectangle shows fluorescence quenching in presence of nitroaromatics, which are the chemical signatures of many explosives.