Demonstration of the facile reversibility of fulvene formation
摘要:
Cleavage of fulvenes under mild conditions and interchange between electron-deficient fulvenes and their constituent cyclopentadienes and imines is demonstrated for the first time. A series of cyclopentadienes and imines are investigated to probe the dependence of fulvene equilibration on structure. The exchange of one fulvene for another is demonstrated in the first reported example of transfulvenation. Finally, the metathesis of two fulvenes to generate all four possible cross products is shown. (C) 2011 Elsevier Ltd. All rights reserved.
Palladium‐Catalyzed Carbonylative Difunctionalization of C=N Bond of Azaarenes or Imines to Quinazolinones
作者:Xibing Zhou、Yongzheng Ding、Hanmin Huang
DOI:10.1002/asia.202000359
日期:2020.6.2
Supporting information for this article is given via a link at the end of the document. By intercepting the acylpalladium species with C=Nbond of azaarenes or imines other than free amines or alcohols, the difunctionalization of C=Nbond was established via palladium‐catalyzed carbonylation/nucleophilic addition sequence. This method is compatible with a diverse range of azaarenes and imines and allows
Abstract A simple and efficient method for preparation of imines by the oxidative coupling of benzyl alcohols with aromatic amines or aliphatic amines was developed. The reaction was catalyzed by 9-azabicyclo[3.3.1]nonan-N-oxyl (ABNO)/KOH with air as the economic and green oxidant. Under the optimal reaction conditions, a variety of imines were obtained in 80%-96% isolated yields.
CeO<sub>2</sub> nanorods anchored on mesoporous carbon as an efficient catalyst for imine synthesis
作者:Longlong Geng、Jinling Song、Yahui Zhou、Yan Xie、Jiahui Huang、Wenxiang Zhang、Luming Peng、Gang Liu
DOI:10.1039/c6cc05496j
日期:——
CeO2 nanorods anchored on mesoporous carbon exhibit high activity and stability in aerobic oxidative coupling of alcohol and amine to imine. The abundant surface Ce3+ and the suitable interaction between...
Aerobic oxidative coupling of alcohols and amines to imines over iron catalysts supported on mesoporous carbon
作者:Longlong Geng、Jinling Song、Bin Zheng、Shujie Wu、Wenxiang Zhang、Mingjun Jia、Gang Liu
DOI:10.1016/s1872-2067(16)62506-8
日期:2016.9
redox mechanism. The oxygen species in FeO x /HCMK-3 participate in the reaction and are then regenerated by oxidation with molecular O 2 . The reaction involves two consecutive steps: oxidative dehydrogenation of an alcohol to an aldehyde and coupling of the aldehyde with an amine to give an imine. Oxidative dehydrogenation of the alcohol is the rate-determining step in the reaction.
以空气或分子氧为氧源的醇和胺的直接氧化偶联是一种环境友好的亚胺合成方法。我们为该反应开发了一种负载在介孔碳(由 FeO x /HCMK-3 表示)上的 Fe 催化剂,具有优异的活性和可回收性。FeO x /HCMK-3 是通过用硝酸铁溶液浸渍 HNO 3 处理的介孔碳 (CMK-3) 制备的。高度分散的 FeO x 物质赋予 FeO x /HCMK-3 高还原性,并负责高催化性能。FeO x /HCMK-3 上的亚胺合成遵循氧化还原机制。FeO x /HCMK-3 中的氧物种参与反应,然后通过与分子 O 2 氧化而再生。该反应包括两个连续的步骤:醇氧化脱氢为醛,醛与胺偶联得到亚胺。醇的氧化脱氢是反应中的限速步骤。