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The present study used silica functionalized bovine serum albumin as a bio‐support for γ‐Fe2O3 nanoparticles (NPs) to synthesize a magnetically recoverable heterogeneous catalyst (BSA‐Si@Fe2O3). The structure of the catalyst was well established by various techniques such as Fourier transform infrared (FT‐IR) spectroscopy, Scanning Electron Microsc...
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In this work, magnetic mesoporous silica-alumina composites (MSA) containing three metal oxides(MSA/MO) with different molar ratio of Si to Al (0.5, 1 and 2) were synthesized. The efficiency of prepared catalysts was compared with modified natural zeolite (ferrierite) in the multicomponent synthesis of indeno[1,2-b]indole-9,10-diones. Immobilizatio...
Citations
... Among MNPs, magnetic iron oxide nanoparticles (IONs) have been given attention because of their numerous properties such as high magnetism [47], stability, easy modification of surface [48], low costs of synthesis [49], catalytic activities [49], low toxicity [47], and ecofriendliness [50]. γ-Fe 2 O 3 NPs have gained popularity among IONs because of their fascinating features, such as great surface area, low toxicity, high thermal stability, and easy synthesis [51]. Because of these appealing properties, γ-Fe 2 O 3 NPs have emerged as a viable support [52,53]. ...
A novel series of heteropoly ionic liquids [HMIm]3[PW12O40], [HMIm]3[PMo12O40], and [HMIm]4[SiW12O40] were synthesized and supported on magnetic γ-Fe2O3 NPs to get magnetic heterogeneous catalysts, Fe2O3-[HMIm]3[PW12O40], Fe2O3-[HMIm]3[PMo12O40], and Fe2O3-[HMIm]4[SiW12O40]. The materials were characterized using various techniques such as FTIR, EDX, XRD, TEM, SEM, elemental mapping, EPR, TGA, and VSM analyses. Among the three heteropoly ionic liquids, [HMIm]3[PW12O40] had very strong acidic sites, as confirmed by potentiometric titration. Fe2O3-[HMIm]3[PW12O40] had also very strong acidic property as analyzed by potentiometric titration. Further, thermal stability of Fe2O3-[HMIm]3[PW12O40] was assessed using TGA analysis, and the catalyst was found stable up to 500 °C. The catalytic prospect of the materials was examined through selective oxidation of benzyl alcohol to benzaldehyde using H2O2 as a green oxidant. The reaction was monitored using GC–MS analysis. Among the three magnetic materials, Fe2O3-[HMIm]3[PW12O40] had the highest catalytic activity in terms of conversion of benzyl alcohol (98%) and benzaldehyde selectivity (100%). A recyclability study of Fe2O3-[HMIm]3[PW12O40] was done and found that the material was recyclable up to 7 cycles without any significant loss in its catalytic performance.
Graphical abstract
На сегодняшний день соединения, содержащие нитрогруппу, являются одним из наиболее важных классов органических соединений. Химия этих молекул привлекает внимание в первую очередь благодаря их использованию в качестве высокоэнергетических реагентов и лекарственных препаратов. Кроме того, введение нитрогруппы является популярным синтетическим приемом, предназначенным для создания новых органических молекул. В настоящем обзоре обобщены результаты современных исследований соединений, содержащих нитрогруппу при двухуглеродном фрагменте: аминонитроэтиленов, α,α-бис(алкилтио)нитроалкенов и их аминопроизводных, α-нитрокетонов, алкилнитроацетатов и нитроацетонитрила. Литературные данные систематизированы в соответствии с типом химических реакций, таких как взаимодействие с нуклеофилами и электрофилами, различные циклизации, реакции с участием C–H-связи и др. Проведено сравнение реакционной способности указанных нитросоединений и условий химических превращений для оценки перспектив их применения.
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