Synthesis of eupomatenoids by three consecutive transition metal-catalyzed cross-coupling reactions
摘要:
Six different eupomatenoids (1a-c, 1f-h) were prepared from 2,3,5-tribroinobenzofuran (2) in a concise and high-yielding synthetic sequence. The overall yields vary between 29 and 60% over four to six steps. Key to the success of the syntheses is the high regioselectivity achieved in three Pd(0)- and Ni(0)-catalyzed cross-coupling reactions which were conducted consecutively. The order of substitution at the benzofuran nucleus is C-2, C-5 and C-3. (C) 2002 Elsevier Science Ltd. All rights reserved.
Platinum(II), palladium(II), and nickel(II) complexes of bisthiourea ligands
作者:Obinna C. Okpareke、William Henderson、Senem Akkoç、Burak Coban
DOI:10.1016/j.ica.2021.120707
日期:2022.2
the monochelated species from the ESI mass spectra of the platinumcomplexes. 31P1H} NMR characterisation of the diarylmethane-bridged bisthiourea complexes [M2(SC(NPh)NHC6H5)2CH2}L4]·2BPh4 (M = Pt, Pd, Ni; L = PPh3 or L2 = dppe) showed complex multiplets indicative of the formation of several isomers of the products. In contrast, the complexes with bridging alkylene chains showed only a single isomer
The synthesis and characterization of Ni, Pd and Pt maleonitriledithiolate complexes: X-ray crystal structures of the isomorphous Ni, Pd and Pt (Ph2PCH2CH2PPh2)M(maleonitriledithiolate) congeners
作者:Katy G. Landis、Allen D. Hunter、Timothy R. Wagner、Larry S. Curtin、Francesca L. Filler、Susan A. Jansen-Varnum
DOI:10.1016/s0020-1693(98)00218-7
日期:1998.11
The synthesis of a series of maleonitriledithiolatecomplexes of nickel, palladium and platinum phosphines having the formulae (dppe)M(mnt) and (Ph3P)2M(mnt) (where dppe = Ph2PCH2CH2PPh2, mnt = 1,2-dicyanoethene-1,2-dithiolate and M = Ni, Pd or Pt) from the reaction of Na2(mnt) and the appropriate (phosphine) MCl2 is reported. These complexes were characterized by a combination of mass spectrometry
Platinum(II) thiosalicylate and related complexes as ligands towards mercury(II) halides; X-ray crystal structure of the tetrametallic complex {[P2)(PPh3)2]·HgI2}2
作者:Louise J. McCaffrey、William Henderson、Brian K. Nicholson
DOI:10.1016/s0277-5387(97)00342-2
日期:1998.1
are discussed in terms of coordination to the various metalhalide moieties. Reactions of the organomercury(II) thiosalicylate complex Thiomersal (EtHgSC 6 H 4 CO 2 Na) with cis -[PtCl 2 (PPh 3 ) 2 ], cis -[MCl 2 (dppe)] (MNi or Pd) leads to complete transfer of the thiosalicylate ligand from the mercury, and isolation of the previously reported thiosalicylate complexes [P t(SC 6 H 4 CO 2 )(PPh 3
摘要硫代水杨酸铂(II)络合物[P t(SC 6 H 4 CO 2)(PPh 3)2] 1a与HgI 2反应形成包含IHg(μ-I)2 HgI中心核与硫醇盐的四金属配合物与每个汞中心配位的1a硫,形成了扭曲的四面体配位环境。总体而言,通过X射线衍射研究确定的配合物的结构特征与母体硫代水杨酸酯配合物1a相似,但相对于铂配位,硫代水杨酸酯配体的折叠角(与46°相比增加了59°)飞机。使用31 P NMR光谱研究了相关的五元环硫醇盐络合物[P t(SCHRCO 2)(PPh 3)2](RH或Me)与1a与一系列金属阳离子的反应。根据与各种金属卤化物部分的配位,讨论了1 J(PtP)耦合常数的变化。硫代水杨酸有机汞(II)硫柳汞(EtHgSC 6 H 4 CO 2 Na)与顺式-[PtCl 2(PPh 3)2],顺式-[MCl 2(dppe)](MNi或Pd)的反应导致从汞中完全转移出硫代水杨
Multimetallic arrays: Symmetrical bi-, tri- and tetrametallic complexes based on the group 10 metals and the functionalisation of gold nanoparticles with nickel-phosphine surface units
作者:Edward R. Knight、Nina H. Leung、Yvonne H. Lin、Andrew R. Cowley、David J. Watkin、Amber L. Thompson、Graeme Hogarth、James D. E. T. Wilton-Ely
DOI:10.1039/b821947h
日期:——
occurs to yield a mixture of the complexes [M(S2CNC4H8NH2)L2]2+ and [(L2M)2(S2CNC4H8NCS2)]2+. However, the monometallic complexes [L2Ni(S2CNC4H8NH2)]2+ (L2=dppe, dppf) and [(L2Ni)2(S2CNC4H8NCS2)]2+ can be prepared without ready symmetrisation. Starting from the previously reported [(dppm)Ru(S2CNC4H8NH2)]2+, the heterotrimetallic products [(dppm)Ru(S2CNC4H8NCS2)M(dppf)]2+ (M=Pd, Pt) can be prepared without
Reactions of 6,6′-bis(nido-decaboranyl) oxide and 6-hydroxy-nido-decaborane with dihalogenobis(phosphine) complexes of nickel, palladium, and platinum, and some related chemistry; nuclear magnetic resonance investigations and the crystal and molecular structures of bis(dimethylphosphine)-di-µ-(2,3,4-η<sup>3</sup>-nido-hexaboranyl)-diplatinum(Pt–Pt), [Pt<sub>2</sub>(µ-η<sup>3</sup>-B<sub>6</sub>H<sub>9</sub>)<sub>2</sub>(PMe<sub>2</sub>Ph)<sub>2</sub>], and of 2,4-dichloro-1,1-bis(dimethylphenylphosphine)-closo-1-nickeladecaborane, [(PhMe<sub>2</sub>P)<sub>2</sub>NiB<sub>9</sub>H<sub>7</sub>Cl<sub>2</sub>]
作者:Norman N. Greenwood、Michael J. Hails、John D. Kennedy、Walter S. McDonald
DOI:10.1039/dt9850000953
日期:——
arachno-palladaplatinaborane species and the first metallaborane of any kind to contain metals from two different periods in the Periodic Table. Treatment of (2) with base followed by cis-[ PdCl2(PMe2Ph)2] gives the 15-vertex trimetallaborane cluster compound [ Pt2(µ-η3- B6H9)(µ-η3- B6H8-η2- PtH (PMe2Ph)2})(PMe2Ph)2]. The 1H, 11B, and 31P n.m.r. behaviour of these compounds have been investigated in detail using both
经过改进的制备和分离6,6'-(B 10 H 13)2 O的步骤也导致了新化合物6-B 10 H 13 OH的分离,该化合物的特征是11 B和1 H核磁共振和质谱。比较了这两种相关的氧硼烷的结构和化学性质。6,6'-(B 10 H 13)2 O或6-B 10 H 13 OH与顺式-[Pt 2 Cl 2 L 2 ](L = PMe 2 Ph或PPh 3的反应)给出三种铂硼烷,蛛网菌-[L 2 PtB 8 H 12 ](1),氨基-[L 2 PtB 10 H 12 ],和[Pt 2(µ-η 3 -B 6 H 9)2 L 2 ](2)。(2)(L = PMe 2 Ph)的黄针是单斜的,空间群P 2 1 / c,a = 1 014.0(2),b = 586.8(2),c= 2 316.9(6)pm,β= 91.66(2)°,Z = 2且分子结构是中心对称的14顶点芳族-二铂硼烷,其中两个B 6 H