MnO2/graphene oxide: a highly active catalyst for amide synthesis from alcohols and ammonia in aqueous media

Nie, Renfeng; Shi, Juanjuan; Xia, Shuixin; Lian, Shixun; Chen, Ping; Hou, Zhenshan; Xiao, Feng‐Shou

doi:10.1039/c2jm34652d

Cited by 91 publications

(52 citation statements)

References 55 publications

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“…SO 2 can also be inserted into GO as the oxidized intermediate, which led to functionalization of graphene oxide with sulfur and further decoration by various types of organic moieties [249]. In addition to acting as catalyst itself, GO/RGO may serve as excellent host to support efficient catalyst for conversion of CO [250], CO 2 [251] and NH 3 [252]. For instance, the oxygenated groups on GO can accelerate formation of Co nanocrystals, leading to 3D reticular structure, which can be seen in the TEM image of Figure 13a.…”

Section: Conversion Of Harmful Gasesmentioning

confidence: 99%

Graphene oxide: A promising nanomaterial for energy and environmental applications

et al. 2015

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Graphene oxide (GO), the functionalized graphene with oxygen-containing chemical groups, has recently attracted resurgent interests because of its superior properties such as large surface area, mechanical stability, tunable electrical and optical properties. Moreover, the surface functional groups of hydroxyl, epoxy and carboxyl make GO an excellent candidate in coordinating with other materials or molecules. Owing to the expanded structural diversity and improved overall properties, GO and its composites hold great promise for versatile applications of energy storage/conversion and environment protection, including hydrogen storage materials, photocatalyst for water splitting, removal of air pollutants and water purification, as well as electrode materials for various lithium batteries and supercapacitors. In this review, we present an overview on the current successes, as well as the challenges, of the GO-based materials for energy and environmental applications.

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Section: Conversion Of Harmful Gasesmentioning

confidence: 99%

Graphene oxide: A promising nanomaterial for energy and environmental applications

et al. 2015

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“…Several strategies for this transformation have been accomplished either under the promotion of heterogeneous or homogeneous catalysts. Ru(OH) x /Al 2 O 3 [24], MnO 2 or MnO 2 -supported on graphite [25,26] and nitrogen-doped graphenelayered cobalt or iron oxides [27] as heterogeneous catalysts have been proved to be effective in the reaction. However, high temperature and pressure are generally required in these cases.…”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Aerobic Oxidation of Alcohols to Nitriles Catalyzed by Copper Iodide in Combination with a Quaternary Ammonium Modified TEMPO

et al. 2015

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A catalytic system consisting of N,N-dimethyl-(4-(2,2,6,6-tetramethyl-1-oxyl-4-piperidoxyl)butyl)dodecyl ammonium bromide (TEMPO-Q), CuI and 2,2 0 -bipyridine was established. This catalytic system (CuI/bpy/TEMPO-Q) showed high activity and good to excellent selectivity in the oxidative conversion of various alcohols to the corresponding nitriles with molecular oxygen as terminal oxidant and aqueous ammonia as nitrogen source under solvent-free conditions. Besides, the catalytic system also offers the advantages of simplified workup procedure. This protocol thus represents a greener pathway for the synthesis of nitriles from alcohols.Graphical Abstract TEMPO-Q, a compound with both a TEMPO and a quaternary ammonium moieties, in combination with copper iodide and 2,2 0 -bipyridine as a catalytic system performed well in the oxidation of alcohols to nitriles with molecular oxygen as terminal oxidant in aqueous ammonia under solvent-free conditions. The catalytic system not only offers the advantages of simplified workup procedure, but also has high activity and selectivity due to the phase transfer catalysis of TEMPO-Q

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“…82,83 By combining the advantages of MnO 2 and GO, Nie et al developed well-organized MnO 2 nanorods/GO composite material (MnO 2 / GO) and used as an efficient, recyclable, heterogeneous catalyst in the direct synthesis of amides from primary alcohols and aqueous ammonia as well as from aldehydes or nitriles. 84 Thus, the base-free reaction of 1 with molecular oxygen and aqueous ammonia in the presence of MnO 2 /GO afforded benzamide 57 in 97% yield with 100% conversion (Scheme 25). 84 Water was found to be the best solvent compared with other polar solvents such as 1,4-dioxane, DMF and dimethyl sulfoxide used for these reactions, and the products could be isolated by simply cooling in ice.…”

Section: Synthesis Of Amidesmentioning

confidence: 99%

“…84 Thus, the base-free reaction of 1 with molecular oxygen and aqueous ammonia in the presence of MnO 2 /GO afforded benzamide 57 in 97% yield with 100% conversion (Scheme 25). 84 Water was found to be the best solvent compared with other polar solvents such as 1,4-dioxane, DMF and dimethyl sulfoxide used for these reactions, and the products could be isolated by simply cooling in ice. Notably, MnO 2 /GO showed very high activity compared with conventional manganese catalysts.…”

Section: Synthesis Of Amidesmentioning

confidence: 99%

Versatilities of graphene-based catalysts in organic transformations

Garg

Ling

2013

Green Materials

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MnO2/graphene oxide: a highly active catalyst for amide synthesis from alcohols and ammonia in aqueous media

Cited by 91 publications

References 55 publications

Graphene oxide: A promising nanomaterial for energy and environmental applications

Graphene oxide: A promising nanomaterial for energy and environmental applications

Solvent-Free Aerobic Oxidation of Alcohols to Nitriles Catalyzed by Copper Iodide in Combination with a Quaternary Ammonium Modified TEMPO

Versatilities of graphene-based catalysts in organic transformations

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