N-杂环卡宾(NHC)N,N'-二(叔丁基)咪唑-2-亚烷基(I t Bu)和1,3-双(2,6- )稳定的钌纳米颗粒(RuNPs)的应用在各种反应条件(溶剂,底物浓度,底物/金属比,温度)下,报道了在几种底物加氢中作为催化剂的二异丙基苯基)亚咪唑-2-亚烷基IPr。RuNHC纳米粒子是芳烃加氢中的活性催化剂,并表现出有趣的配体效应,RuIPr NPs通常比RuI t Bu具有更高的活性。
A catalytic stereo- and chemo-selective method for the reduction of substituted aromatics
作者:Fabienne Fache、Stéphan Lehuede、Marc Lemaire
DOI:10.1016/0040-4039(94)02386-p
日期:1995.2
Various substitutedaromatics have been reduced using colloidal ruthenium under H2 pressure with good stereoselectivity (cis/trans up to 60). Interesting chemoselectivities are also observed.
<sup>13</sup>C nuclear magnetic resonance spectra of methoxycyclohexane derivatives. Rotamer populations about C–OMe bonds as indicated by<sup>13</sup>C chemical shifts of methoxy- and ring-carbons and<sup>3</sup>J<sub>C,H</sub>coupling constants
作者:Alan H. Haines、Mohammad Seyedi Shandiz
DOI:10.1039/p19810001671
日期:——
Methoxy 13C chemicalshifts in methoxycyclohexanederivatives may be rationalized in terms of rotamerpopulationsabout the C–OMe bond and δ1-effects caused by steric interaction of the methoxy-group with substituents at the neighbouring 2- and 6-positions. Information on rotamerpopulations is obtained also from the 13C chemicalshifts of C-2 and C-6, and from the three-bond coupling between the proton
A colloidal system based on an aqueous suspension of rhodium(o) nanoparticles proved to be an efficient catalyst for the hydrogenation of arene derivatives under biphasic conditions. The rhodiumnanoparticles (2-2.5 nm) were synthesized by the reduction of RhCl3 x 3H2O with sodium borohydride and were stabilized by highly water-soluble N-alkyl-N-(2-hydroxyethyl)ammonium salts (HEA-Cn). These surfactant
事实证明,基于铑(o)纳米粒子水悬浮液的胶体体系是在双相条件下氢化芳烃衍生物的有效催化剂。通过用硼氢化钠还原RhCl3 x 3H2O合成铑纳米粒子(2-2.5 nm),并通过高度水溶性的N-烷基-N-(2-羟乙基)铵盐(HEA-Cn)使其稳定。通过测量表面张力来表征这些表面活性剂分子,并通过透射电子低温显微镜观察到具有铑的水分散体。在超温和的条件下,即室温和1 atm H2压力下,该催化系统是有效的。包含受保护的铑(0)胶体的水相可以重复使用,而不会显着降低活性。
Arene Hydrogenation with a Stabilised Aqueous Rhodium(0) Suspension: A Major Effect of the Surfactant Counter-Anion
作者:Alain Roucoux、Jürgen Schulz、Henri Patin
DOI:10.1002/adsc.200390016
日期:2003.1
A reduced aqueous colloidal suspension of rhodium shows an efficient activity in the catalytic hydrogenation of various benzene derivatives under biphasic conditions at room temperature and under atmospheric hydrogen pressure. The rhodium nanoparticles in the size range of 2–2.5 nm have been synthesised by reducing RhCl3⋅3 H2O with sodium borohydride and were stabilised by highly water-soluble N,N
phosphine and phosphite ligands I–IV were synthesised, characterised and applied as catalysts in the partial hydrogenation of substituted arenes. In the case of disubstituted arenes, selectivities for the corresponding cyclohexene derivatives of up to 39% were achieved at ca. 40% conversion. The effect of parameters such as temperature and pressure was also examined. In the hydrogenation of styrene, very