Tetranuclear Strontium and Barium Siloxide/Amide Clusters in Metal‐Ligand Cooperative Catalysis
作者:Benjamin Freitag、Phillip Stegner、Katharina Thum、Christian A. Fischer、Sjoerd Harder
DOI:10.1002/ejic.201800231
日期:2018.5.15
One‐pot reaction of 2,6‐iPr2‐aniline (DIPP‐NH2) with (Me2SiO)3 and Sr[N(SiMe3)2]2 (SrN′′2) gave a tetranuclear cluster consisting of four dianions [OSiMe2N‐DIPP]2– and four Sr2+ ions solvated each by one THF ligand. The general applicability of this method was investigated by variation of amine and metal. Anilines with smaller substituents led to insoluble uncharacterized coordination polymers, whereas
The Pudovik reaction (addition of organophosphorus compounds containing a labile P-H bond with alkenes and alkynes) can progess via a radical or (and) ionic mechanism. A comparative and systematic study including various reagents and different activation methods (heating, photochemical or ultrasonic irradiation, and dry medium supported reactions) is presented. Photolysis is the most efficient method
N-Heterocyclic Carbene-Ytterbium Amide as a Recyclable Homogeneous Precatalyst for Hydrophosphination of Alkenes and Alkynes
作者:Jia Yuan、Hongfan Hu、Chunming Cui
DOI:10.1002/chem.201600512
日期:2016.4.11
carbene–ytterbium(II) amides (NHC)2Yb[N(SiMe3)2]2 (1: NHC: 1,3,4,5‐tetramethylimidazo‐2‐ylidene (IMe4); 2: NHC: 1,3‐diisopropyl‐4,5‐dimethylimidazol‐2‐ylidene (IiPr)) and the NHC‐stabilized rare‐earth phosphide (IMe4)3Yb(PPh2)2 (3) have been synthesized and fully characterized. Complexes 1–3 are active precatalysts for the hydrophosphination of alkenes, alkynes, and dienes and exhibited much superior catalytic
Synthesis and molecular structures of divalent bridged bis(guanidinate) europium complexes and their application in intermolecular hydrophosphination of alkenes and alkynes
EuIIIL2Cl(THF)2 (L2 = 1,8-C10H6NC(NiPr)(NHiPr)}2) by the reaction of EuCl3 with 0.5 equiv. of [Li2L22Li2] in THF with Na/K alloy yielded a novel EuII complex [EuIIL2(THF)]2 (3) in good yield. Complex 3 was characterized by an X-ray crystal structure analysis. Complex 3 features an unusual μ-η1:η2:η2 coordination mode of the bridged bis(guanidinate) ligand onto EuII. Complexes 2 and 3 are efficient pre-catalysts
一当量无水EuCl 3的反应。三碳的锂盐的桥连的双(胍基)栗2大号1(L 1 = [我镨(ME 3 Si)的NC(N我PR)N(CH 2)3 NC(N我PR)N(森达3)i Pr])在THF中得到氯Eu III L 1 Cl(THF)2(1)。配合物1与Na / K合金在THF中的摩尔比为1:2的还原反应得到了一种新的Eu II。由意外的新的桥接双(胍基)配体L 3,[Eu II L 3 ] 2(L 3 = [ i Pr(Me 3 Si)NC(N i Pr)N(CH 2)3 N(SiMe 3)C(N我PR)2 ])(2),通过一个胍基的L中的再分配1还原期间。复杂2在结构上表征是复杂的双核,其中两个Eu的金属通过两个L连接在一起的3即采用了μ-η配体1:η2:η 2配位模式为一个L 3配体和μ-η 2:η 2:η 2模式为其他。通过EuCl 3与0.5的反应处理原位形成的Eu III L 2
Hydrophosphination using [GeCl{N(SiMe<sub>3</sub>)<sub>2</sub>}<sub>3</sub>] as a pre-catalyst
作者:A. N. Barrett、H. J. Sanderson、M. F. Mahon、R. L. Webster
DOI:10.1039/d0cc05792d
日期:——
The hydrophosphination of activated alkenes and internal alkynes is reported using a remarkably simple Ge(iv) pre-catalyst. Preliminary mechanistic investigations indicate that the reaction proceeds via a redox neutral catalytic cycle.