在乙腈中的汞电极上反式-[Ni(CN)2 L 2 ]配合物[L = PEt 3,PPr 3,PBu t 3,PEtPh 2,PEt 2 Ph或P(C 6 H 11)3 ]的氧化还原反应通过循环伏安法,控制电位电解法和分光光度法对溶液进行了研究。除了[Ni(CN)2 {P(C 6 H 11)3 } 2],它表现出不同的行为,所有被研究的络合物至少经历了两个随后的阴极过程,其中电荷转移步骤分别导致不稳定和不寻常的双氰基(膦)-镍(I)和-镍(O)络合物,它们都在短时间内通过两种不同的反应路径降解为二聚体镍(I)物种。当中性配体是具有足够的π受体能力的膦时,可以检测到第三种阴极过程,其中二聚体镍(I)物种进一步还原为不含氰化物作为配体的膦镍(O)配合物。提出了与数据一致的归约机制。讨论了还原电位对膦配体性质的依赖性以及初级镍(I)和镍(O)还原产物的立体化学。
Coordination chemistry of higher oxidation states Part 9 [1]. Nickel(III) complexes of monodentate phosphines and related ligands
作者:Simon J. Higgins、William Levason、Deborah J. Wilkes
DOI:10.1016/s0020-1693(00)87660-4
日期:1984.4
The known nickel(III) complexes [Ni(PR3)2X3]) (X = Cl, Br) with monodentate phosphines (PMe3, PEt3, PnBu3, PMe2Ph X = Br only) have been reexamined, some being obtaines in a pure state for the first time. New complexes with PMe2Ph, PEt2Ph and PMePh2 are described. Detailed spectroscopic data (IR, UV/Visible and EPR) are reported and assigned for all complexes, leading to the proposal of trans-trigonal
A Broadly Applicable Strategy for Entry into Homogeneous Nickel(0) Catalysts from Air-Stable Nickel(II) Complexes
作者:Eric A. Standley、Stacey J. Smith、Peter Müller、Timothy F. Jamison
DOI:10.1021/om500156q
日期:2014.4.28
A series of air-stable nickel complexes of the form L2Ni(aryl) X (L = monodentate phosphine, X = Cl, Br) and LNi(aryl)X (L = bis-phosphine) have been synthesized and are presented as a library of precatalysts suitable for a wide variety of nickel-catalyzed transformations. These complexes are easily synthesized from low-cost NiCl2·6H2O or NiBr2·3H2O and the desired ligand followed by addition of 1
已经合成了一系列 L 2 Ni(芳基)X(L = 单齿膦,X = Cl,Br)和 LNi(芳基)X(L = 双膦)形式的空气稳定镍配合物,并表示为适用于各种镍催化转化的预催化剂库。这些配合物很容易由低成本的 NiCl 2 ·6H 2 O 或 NiBr 2 ·3H 2合成O 和所需的配体,然后加入 1 当量的格氏试剂。选择的这些配合物通过单晶 X 射线衍射进行了表征,并提供了对其结构特征的分析。介绍了将它们用作镍催化羰基-烯反应的预催化剂的案例研究,与使用 Ni(cod) 2 的反应相比,显示出优异的反应性。此外,由于预催化剂都对空气稳定,因此不需要手套箱或惰性气氛技术来利用这些配合物进行镍催化反应。
Process Design and Scale-Up of the Synthesis of 2,2‘:5‘,2‘ ‘-Terthienyl
作者:B. J. J. Smeets、R. H. Meijer、J. Meuldijk、J. A. J. M. Vekemans、L. A. Hulshof
DOI:10.1021/op020044n
日期:2003.1.1
The objective of this study was the design of a scaleable process for the synthesis of 3−4 mol of α-terthienyl from 2,5-dibromothiophene and thienylmagnesium bromide in a 10-L stirred tank reactor. In THF the Grignard reagent, thienylmagnesium bromide, was readily formed from 2-bromothiophene and magnesium. To avoid crystallization the maximal concentration was limited to 1.4 M. Furthermore, the novel
Metal−Metal Interactions in Dinuclear d<sup>8</sup> Metal Cyanide Complexes Supported by Phosphine Ligands. Spectroscopic Properties and ab Initio Calculations of [M<sub>2</sub>(<i>μ</i>-diphosphine)<sub>2</sub>(CN)<sub>4</sub>] and <i>trans</i>-[M(phosphine)<sub>2</sub>(CN)<sub>2</sub>] (M = Pt, Ni)
作者:Bao-Hui Xia、Chi-Ming Che、David Lee Phillips、King-Hung Leung、Kung-Kai Cheung
DOI:10.1021/ic020077j
日期:2002.7.1
Structural, spectroscopic properties on the dinuclear [M(2)(dcpm)(2)(CN)(4)] (M = Pt, 1a; Ni, 2a, dcpm = bis(dicyclohexylphosphino)methane) and [M(2)(dmpm)(2)(CN)(4)] (M = Pt, 1b; Ni, 2b, dmpm = bis(dimethylphosphino)methane) and the mononuclear trans-[M(PCy(3))(2)(CN)(2)] (M = Pt, 3; Ni, 4, PCy(3) = tricyclohexylphosphine) and theoretical investigations on the corresponding model compounds are described
The neutral complexes (η5-C5H5NiXL (X = Cl, L = PPh3 (I); L = PCy3 (II); X = Br, L = PPh3 (III); L = PCy3 (IV); X = I, L = PPh3 (V); L = PCy3 (VI)) have been obtained by treating NiX2L2 with thallium cyclopentadienide. The same reaction in the presence of TlBF4 gives cationic derivatives [(η5-C5H5)NiL2]BF4 (L = 2PPh2Me (VII); L = dppe (VIII)), whereas mononuclear complexes containing two different
中性配合物(η 5 -C 5 H ^ 5 NiXL(X =氯,L = PPH 3(I)为:L = PCY 3(II); X = Br的,L = PPH 3(III)为:L = PCY 3( IV); X = I,L = PPh 3(V); L = PCy 3(VI))是通过用环戊二烯化treating处理NiX 2 L 2获得的。在TlBF 4存在下的相同反应得到阳离子衍生物[( η 5 -C 5 H ^ 5)无2 ] BF 4(L = 2PPh 2我(VII); L = DPPE(VIII)),而含有两种不同的配体(L单核配合2 = PPH 3 + PCY 3(IX))或双核[(η 5 -C 5 H ^ 5)的Ni(PPH 3)] 2 DPPE(BF 4)2(X)是由III与TlBF 4在不同配体存在下的反应获得的。用Na / Hg的阳离子络合物的还原,得到非常不稳定镍(I)衍生物(η 5