Herein we report an effective and simple preparation method of substituted azoxybenzenes by reductive dimerization of nitrosobenzenes. This procedure requires no additional catalyst/reagent and can be applied to substrates with a wide range of substitution patterns.
Controllable synthesis of azoxybenzenes and anilines with alcohol as the reducing agent promoted by KOH
作者:Rui Ping Wei、Feng Shi
DOI:10.1080/00397911.2019.1566472
日期:2019.3.4
Abstract Nitrobenzene and its derivatives can be selectively reduced to the corresponding azoxybenzene and aniline compounds with alcohols as the hydrogen source and KOH as the promoter only by simple changes of reaction conditions. Graphical Abstract
REDUCTION OF AROMATIC AND ALIPHATIC NITRO COMPOUNDS BY SODIUM HYDROGEN TELLURIDE
作者:Atsuhiro Osuka、Hirohito Shimizu、Hitomi Suzuki
DOI:10.1246/cl.1983.1373
日期:1983.9.5
Various nitro compounds were effectively reduced by sodium hydrogen telluride in good yields. Thus, reductive conversion of unhindered nitrobenzenes to azoxybenzenes, sterically hindered nitrobenzenes to anilines, nitroalkanes to dimer of nitrosoalkanes, and vicinal-dinitroalkane to olefin was achieved.
SO2F2-mediated oxidation of primary and tertiary amines with 30% aqueous H2O2 solution
作者:Xudong Liao、Yi Zhou、Chengmei Ai、Cuijiao Ye、Guanghui Chen、Zhaohua Yan、Sen Lin
DOI:10.1016/j.tetlet.2021.153457
日期:2021.11
highly efficient and selective oxidation of primary and tertiaryamines employing SO2F2/H2O2/base system was described. Anilines were converted to the corresponding azoxybenzenes, while primary benzylamines were transformed into nitriles and secondary benzylamines were rearranged to amides. For tertiaryamine substrates quinolines, isoquinolines and pyridines, their oxidation products were the corresponding
描述了使用 SO 2 F 2 /H 2 O 2 /碱系统对伯胺和叔胺进行高效和选择性氧化。苯胺转化为相应的偶氮苯,而伯苄胺转化为腈,仲苄胺重排为酰胺。对于叔胺底物喹啉、异喹啉和吡啶,它们的氧化产物是相应的N-氧化物。反应条件非常温和,仅涉及 SO 2 F 2、胺类、30% H 2 O 2水溶液溶液和无机碱在室温下。一个独特的优点是该氧化系统仅由廉价的无机化合物组成,而没有使用任何金属和有机化合物。
Switchable Selectivity during Oxidation of Anilines in a Ball Mill
for the direct oxidation of anilines to the corresponding azo and azoxy homocoupling products by using a planetary ballmill was developed. Various oxidants and grinding auxiliaries were tested and a variety of substituted anilines were investigated. It was possible to form chemoselectively either azo, azoxy, or the nitro compounds from reaction of aromatic anilines. The selectivity of the solvent‐free