【摘 要】
：
The reaction of anhydrous FeBr2 with two equivalents of anionic N-heterocyclic carbene (NaL1 and NaL2), which are generated in situ by the reaction of the corre
【机 构】
：
Key Laboratory of Organic Synthesis of Jiangsu Province,College of Chemistry and Molecular Sciences
论文部分内容阅读
The reaction of anhydrous FeBr2 with two equivalents of anionic N-heterocyclic carbene (NaL1 and NaL2), which are generated in situ by the reaction of the corresponding salt [4-R-C6H4COCH2{CH- (NCHCHNiPr)}Br] (R = OCH3, H2L1Br, 1; R = F, H2L2Br, 2) with two equivalents of NaN(SiMe3)2, affords bis-ligand Fe(Ⅱ) complexes of L21Fe (3) and L22Fe (4) in high yield, respectively. Attempt to synthesize mono-ligand Fe(Ⅱ) bromide by the 1:1 molar ratio of NaL to FeBr2 is unsuccessful, and the same complexes of 3 and 4 were obtained. Both 3 and 4 have been depicted by elemental analysis and X-ray structure determination. Preliminary studies show that both 3 and 4 can be used as single-component catalyst for the ring-opening polymerization of ε-caprolactone, and the catalytic activity of 3 is higher than that of 4.
其他文献
The Yunnan box turtle (Cuora yunnanensis, Boulenger, 1906), which has drawn much attention in conservation biology, was regarded as extinct since it was previou
Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique.X-ray diffraction and X-ray photoelectron spectroscopy
利用HIRFL提供的50MeV/u的13C束流轰击Be靶,通过RIBLL选择出放射性核素11Li.实验采用透射法测量了25-45MeV/u的11Li在28Si靶上的反应总截面.采用双参数Gauss密度分布形式,利
We present the (-Λ)-hyperon global polarization in Au+Au collisions at (√SNN)=62GeV and 200GeV measured with the STAR detector at RHIC. The observed (-Λ)-hyp
A new method is presented for measuring event-by-event fluctuations of elliptic flow (v2) using first order event planes. By studying the event-by-event distrib
利用改进的核密度模型和动量守恒条件,找到了核内胶子分布函数的核效应参数公式,其中利用了已经建立的核密度与原子核的平均结合能之间的联系.利用该模型所得到的核内胶子分
Two composites LaNi4.8Sn0.2/CNTs and NdNi4.8Sn0.2/CNTs were prepared by an impregnation-reduction method.Their hydrogen storage capacity could reach up to 2.96
A novel supersonic plasma spraying was used to prepare rare earth oxides doped CoCrW coatings. X-ray diffractometer, contact surface profiler, hardness tester,