sustainable Pd/SiO 2 nanospheres catalyst. Further, its catalytic activity was demonstrated for the direct reductive coupling of nitroarenes under mild conditions. While the reaction with Pdnanoparticles on other supporting materials such as modified carbon materials and TiO 2 , under similar conditions, resulted formation of amines exclusively. Therefore, it was confirmed that the SiO 2 was found to
Chemoselective electrochemical reduction of nitroarenes with gaseous ammonia
作者:Liu Chang、Jin Li、Na Wu、Xu Cheng
DOI:10.1039/d1ob00077b
日期:——
Valuable aromatic nitrogen compounds can be synthesized by reduction of nitroarenes. Herein, we report electrochemicalreduction of nitroarenes by a protocol that uses inert graphite felt as electrodes and ammonia as a reductant. Depending on the cell voltage and the solvent, the protocol can be used to obtain aromatic azoxy, azo, and hydrazo compounds, as well as aniline derivatives with high chemoselectivities
The polyhedral nature of selenium-catalysed reactions: Se(<scp>iv</scp>) species instead of Se(<scp>vi</scp>) species make the difference in the on water selenium-mediated oxidation of arylamines
Selenium-catalysed oxidations are highly sought after in organic synthesis and biology. Herein, we report our studies on the on water selenium mediated oxidation of anilines. In the presence of diphenyldiselenide or benzeneseleninic acid, anilines react with hydrogen peroxide, providing direct and selective access to nitroarenes. On the other hand, the use of selenium dioxide or sodium selenite leads
硒催化氧化在有机合成和生物学中备受追捧。在此,我们报告了我们对水硒介导的苯胺氧化的研究。在二苯基二硒化物或苯硒酸存在下,苯胺与过氧化氢反应,直接和选择性地获得硝基芳烃。另一方面,使用二氧化硒或亚硒酸钠会产生氧化偶氮芳烃。仔细的机理分析和77 Se NMR 研究表明,只有 Se( IV ) 物质,如苯过氧硒酸,是参与在水中运行并导致硝基芳烃的催化循环的活性氧化剂。虽然最近在有机溶剂中发生的其他硒催化氧化反应已被证明是通过 Se( VI) 关键中间体,苯胺在水中氧化成硝基芳烃没有。这些发现揭示了有机硒催化转化的多方面性质,并开辟了利用硒基催化的新方向。
Selective N-oxidation of aromatic amines to nitroso derivatives using a molybdenum acetylide oxo-peroxo complex as catalyst
作者:Ankush V. Biradar、Trupti V. Kotbagi、Mohan K. Dongare、Shubhangi B. Umbarkar
DOI:10.1016/j.tetlet.2008.04.005
日期:2008.5
oxo-peroxo complex obtained in situ by the treatment of the corresponding molybdenum acetylide carbonyl complex, CpMo(CO)3(CCPh); Cp = η5-C5H5 with H2O2, has been used as an efficient catalyst for selective N-oxidation of primaryamines to nitroso derivatives. Excellent amine conversion (up to 100%) and very high selectivity for nitroso compounds (99%) have been obtained using 30% hydrogen peroxide as
A Green Chemoenzymatic Process for the Synthesis of Azoxybenzenes
作者:Fengjuan Yang、Zhi Wang、Xiaowen Zhang、Liyan Jiang、Yazhuo Li、Lei Wang
DOI:10.1002/cctc.201500720
日期:2015.11
efficient chemoenzymaticprocess for the synthesis of azoxybenzenes was developed. A peracid was generated in situ by Novozym 435, and then a range of anilines were oxidized by the produced peracid to afford azoxybenzenes in yields ranging from 63.1 to 94.1 %. This method expands the application of lipase in organic synthesis and provides an alternative method for the synthesis of azoxybenzenes.