Base-Promoted/Gold-Catalyzed Intramolecular Highly Selective and Controllable Detosylative Cyclization
作者:Chenghao Zhu、Lin Qiu、Guangyang Xu、Jian Li、Jiangtao Sun
DOI:10.1002/chem.201502073
日期:2015.9.7
controllable and synthetically useful base‐promoted intramolecular detosylative cyclization of bis‐N‐tosylhydrazones has been achieved, affording N‐containing heterocycles and cyclic olefins under transition‐metal‐free or gold‐catalyzed procedures, respectively. Moreover, an effective and practical metal‐free or gold‐catalyzed approach to synthesize polycyclic aromatic compounds is also reported.
Ruthenium nanoparticles supported on mesoporous MCM-41 as an efficient and reusable catalyst for selective oxidation of arenes under ultrasound irradiation
作者:Alireza Khorshidi
DOI:10.1016/s1872-2067(15)61001-4
日期:2016.1
used as a support for the uniform dispersion of rutheniumnanoparticles having an average particle size of ∼5 nm. The obtained nanocomposite, MCM-41-Ru, was characterized using inductively coupled plasma, transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and BET surface area measurements. The material was employed as an efficient and recyclablecatalyst in the ultrasound-assisted
摘要 介孔 MCM-41 被用作均匀分散平均粒径为 5 nm 的钌纳米颗粒的载体。获得的纳米复合材料 MCM-41-Ru 使用电感耦合等离子体、透射电子显微镜、能量色散 X 射线分析、X 射线衍射和 BET 表面积测量进行表征。该材料在芳烃的超声辅助氧化中用作有效且可回收的催化剂。据观察,在 MCM-41-Ru 纳米粒子的存在下,超声辐照与作为氧化剂的 KBrO 3 组合加速氧化反应,以良好的产率提供所需的产物。回收的催化剂在连续运行中保持活性,其活性位点的性质不断变化。
Synthesis of substituted benzene derivatives by homo- and hetero-coupling of 2-bromobenzaldehyde and bromovinylaldehydes followed by McMurry coupling
作者:Surajit Some、Bishnupada Dutta、Jayanta K. Ray
DOI:10.1016/j.tetlet.2005.11.146
日期:2006.2
A convenient synthetic approach to substituted benzene derivatives by modified Ullmann cross-coupling of 2-bromobenzaldehyde and bromovinylaldehydes followed by intramolecular McMurry coupling has been developed. (c) 2005 Elsevier Ltd. All rights reserved.