Vinyl polymerization of norbornene catalyzed by a new bis(β‐ketoamino)nickel(II) complex–methylaluminoxane system

A new β‐ketoimine ligand was prepared through traditional condensation of 2‐acetylcyclohexanone with 1‐naphthylamine. Consequently, the new moisture‐ and air‐stable bis(β‐ketoamino)nickel(II) complex Ni[2‐CH₃C(O)C₆H₈(NAr)]₂ (Ar = naphthyl) was synthesized and characterized. The solid‐state structures of the ligand and complex have been determined by single‐crystal X‐ray diffraction. Additionally, the new complex is a highly active catalyst precursor for polymerization of norbornene in combination with methylaluminoxane. Copyright © 2005 John Wiley & Sons, Ltd.     

Extraction of copper ions using silica gel with chemically modified surface

The applicability of silica gels for the application in solid-phase extraction was tested. Silica was modified with ketoimine groups. Surface characteristics of the modified silica were determined by elemental analysis, NMR spectra of solid phases (²⁹Si CP MAS NMR), analysis of pore size distribution of the silica support, and nitrogen adsorption-desorption. Newly proposed sorbents with ketoimine groups were applied in the preconcentration of trace amounts of the Cu (II) ions from lake water, post-industrial water, and demineralized water unburdened back to the lake. Presented at the 34th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 21–25 May 2007.     

Synthesis and Characterization of Polynuclear Metal Complexes with Bridging Ketoiminato and Thioiminato Schiff Base Ligands

Bimetallic and trimetallic complexes of stoichiometry [M(acacen)M′Y₂], [M(sacacen)M′Y₂], and {[M(acacen)]₂M′Y₂} have been prepared by reaction of the appropriate square-planar Schiff base metal complex with various secondary metal salts in toluene and/or absolute ethanol. Systems which are reported here include those where M = Cu(II); M′ = Cu(II), Ni(II), Co(II), Mn(lI) and Zn(II); Y^? = Cl^?, Br^?, and NO₃ ^?. Trinuclear complexes have been isolated only for {[Cu(acacen)]₂M′(NO₃)₂} where M′ = Cu(lI) or Mn(II); binuclear complexes result from all other combinations. The geometry of the chelated Cu(II) ion is square-planar in the bimetallic complexes and possibly square-pyramidal in the trimetallic compounds, while that of the secondary metal ion depends on the coordination preference of M′, the nature of Y^? and whether the bridging donor atoms are oxygen or sulfur. Probable structures of the new polynuclear complexes have been deduced from spectral, conductivity and magnetic measurements.     

Crystal Structure of 1-Phenyl-1,3-butandione Benzidine Diketoimine

1-Phenyl-1,3-butandione benzidine diketoimine 2a (C32H28N2O2,Mr=472.56) was synthesized in high yield by the reaction of 1-phenyl-1,3-butandione with benzidine in absolute ethanol,and determined by X-ray structure analysis. It crystallizes in the orthorhombic system,space group P21/c with a=7.9839(16),b=12.910(3),c=12.358(3),α=90.00,β=93.71(3),γ= 90.00°,V=1271.1(4)3,Z=2,Dc=1.235 g/cm3,μ=0.077 mm-1,F(000)=500,the final R= 0.0717 and wR=0.1187. It presents a linear centrosymmetric framework constituted by a linkage of benzidine as a bridge and two terminal 1-phenyl-1,3-butanedione moieties.     

Synthesis and crystal structure of a novel prochiral ketoimine: (E)‐acetophenone O‐diphenylphosphoryl oxime

A novel activated prochiral ketoimine, (E)‐acetophenone O‐diphenylphosphoryl oxime, C₂₀H₁₈NO₂P, with an electron‐withdrawing substituent on the imine N atom similar to other prochiral ketoimines, has been synthesized and the X‐ray crystal stucture determined. The molecules pack together in the solid state via weak intermolecular C—H...O interactions and both face‐to‐face and edge‐to‐face π‐stacking interactions.     

亚胺及其类似物的催化不对称炔基化反应新进展

手性炔丙胺是天然产物和药物活性分子不对称全合成中常用的关键中间体,亚胺及其类似物的不对称炔基化反应可以为该砌块提供高效高对映选择性的合成路径;此外通过合理的底物和反应设计,亚胺的不对称炔基化反应还能作为一系列串联反应的起点,来合成多种结构新颖的含氮杂环化合物.因此,亚胺及其类似物的高效高对映选择性炔基化反应得到合成化学...