Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1<i>H</i>-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
report the synthesis of amines/imines directly from alcohol and amines via hydrogen autotransfer or acceptorless dehydrogenation catalyzed by well-defined phosphine-free Mn complexes. Both imines and amines can be obtained from the same set of alcohols and amines using the same catalyst, only by tuning the reaction conditions. The amount and nature of the base are found to be a highly important aspect for
Switchable Bifunctional Bistate Reusable ZnO–Cu for Selective Oxidation and Reduction Reaction
作者:Kasturi Sarmah、Subhamoy Mukhopadhyay、Tarun K. Maji、Sanjay Pratihar
DOI:10.1021/acscatal.8b03785
日期:2019.1.4
copper loaded zinc oxide (ZnO–Cu) for its stimuli (O2/light) responsiveswitchable performance between its reduced (S-1) and oxidized (S-2) state for two antagonistic reactions, namely oxidation of alkyl arenes/heteroarenes to aldehydes/ketones and reduction of nitro arenes/heteroarenes to corresponding amines. The two states of the catalyst showed its switchable performance as highly active and poorly
在这里,我们公开了利用铜负载的氧化锌(ZnO-Cu)在两个还原反应(即氧化)的还原(S-1)和氧化(S-2)状态之间的刺激(O 2 /光)响应可转换性能。将烷基芳烃/杂芳烃还原为醛/酮,并将硝基芳烃/杂芳烃还原为相应的胺。催化剂的两种状态均显示出其可切换的性能,即用于氧化和还原的高活性和低活性催化剂,并且通过改变刺激(光和O 2 / N 2),两个反应都可以“关闭”和“打开”。)。发现状态之间的转换效率及其相对反应性在各种反应条件下均保持一致,并且无论氧化还原顺序(反之亦然)和反应中使用的底物如何,都保持不变。光催化剂(S-1和S-2)表现出良好的催化活性,多种可重复使用性,广泛的底物范围以及对两种反应均具有合理的官能团耐受性,并在大规模应用中探索了其质量性能。该系统被用于辅助串联催化装置中,用于通过催化状态之间的刺激响应切换而利用氧化和还原反应两者来合成苄胺。
A pyridinium/anilinium [2]catenane that operates as an acid–base driven optical switch
作者:Sarah J Vella、Stephen J Loeb
DOI:10.3762/bjoc.14.165
日期:——
two charged recognition sites with occupancy favoring the bis(pyridinium)ethane site by a ratio of 4:1. The unprotonated [2]catenane has a deep yellow/orange color when the DB24C8 ring resides solely at the bis(pyridinium)ethane site and changes to colorless when the crownether is shuttling (i.e., circumrotating) back and forth between the two recognition sites thus optically signalling the onset of
Chemoselective Reduction of the P=O Bond in the Presence of P-O and P-N Bonds in Phosphonate and Phosphinate Derivatives
作者:Sylwia Sowa、K. Michał Pietrusiewicz
DOI:10.1002/ejoc.201801518
日期:2019.2.7
The chemoselectivereduction of P=O bond in α‐hydroxy and α‐amino phosphonic/phosphinic acid derivatives can be achieved without concomitant scission of their ester and amide bonds using commercially available BH3 complexes. The reduction involves an intramolecular assistance by the proximal OH or NH groups enabling preferential removal of the phosphoryl oxygen.