So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Sheng, Yao; Wang, Xueguang; Yue, Shengnan; Cheng, Gonglin; Zou, Xiujing; Lu, Xionggang researched the compound: 3-Bromo-4-chloronitrobenzene( cas:16588-26-4 ).Computed Properties of C6H3BrClNO2.They published the article 《In Situ Synthesized Silica-Supported Co@N-Doped Carbon as Highly Efficient and Reusable Catalysts for Selective Reduction of Halogenated Nitroaromatics》 about this compound( cas:16588-26-4 ) in ChemCatChem. Keywords: aromatic amine preparation chemoselective; nitrobenzene reduction cobalt catalyst. We’ll tell you more about this compound (cas:16588-26-4).
Silica-supported Co@N-doped carbon (Co@CN/SiO2) catalysts were first prepared by a one-step impregnation with a mixed solution of cobalt nitrate, glucose and urea, followed by in situ carbonization and reduction The Co@CN/SiO2 catalysts were investigated for the selective reduction of nitro aromatics RNO2 (R = Ph, 4,5-dichloro-2-nitroaniline, 2-chloro-3-nitropyridine, etc.) to the corresponding anilines RNH2 using hydrazine hydrate. The Co@CN/SiO2-500 carbonized at 500°C exhibited the highest catalytic activity and excellent stability without any decay of activity after 6 cycles for the reduction of nitrobenzene. Both metallic Co atoms and Co-N species formed in the Co@CN/SiO2 catalysts were active, but the Co-N species were dominant active sites. The high activities of the Co@CN/SiO2 catalysts were attributed to the synergistic effect between the Co and N atoms, promoting heterolytic cleavage of hydrazine to form H+/H- pairs. Representative examples demonstrated that the Co@CN/SiO2-500 could completely transform various halogen-substituted nitro aromatics to the corresponding halogenated anilines with high TOFs and selectivity of >99.5%.
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