Pd nanoparticles immobilized on PAMAM-grafted MWCNTs hybrid materials as new recyclable catalyst for Mizoraki–Heck cross-coupling reactions

Nabid, Mohammad Reza; Bide, Yasamin; Rezaei, Seyed Jamal Tabatabaei

doi:10.1016/j.apcata.2011.08.021

Cited by 88 publications

(50 citation statements)

References 70 publications

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“…According to the results of the effect of temperature and reaction time on the reduction of 4-pyridinecarbonitrile, the highest yield was obtained at 95°C and 1 h (Table 3, entry 8). After the amount of catalyst, reaction temperature and time were optimized, the influence of solvent on the reaction was studied in the next step (Table 3, entries [11][12][13][14][15]. It was found that the best system was water as solvent using 1 mol% of catalyst at 95°C and a time of 1 h.…”

Section: Resultsmentioning

confidence: 99%

“…[5,6] Three structures for a catalyst delivery system have been investigated, namely the core of the dendrimer as the single catalytic unit, [7] the dendritic box (intermediate positions within a dendrimer) [8] and the terminal ends of the dendrimer that covalently bind to catalytic units. [9][10][11][12][13] There are many examples of the use of functionalized dendrimers in catalysis of reactions including Heck couplings, [14][15][16] decarboxylation, [17] oxidation, [18] reduction, [19] Michael addition [20] and so on.…”

Section: Introductionmentioning

confidence: 99%

“…Ni, Co, Fe and Cu metals or oxides). [47][48][49][50][51][52] To take advantage of these characteristics and also as a part of our ongoing research programme on the design of new catalysts for the development of useful and green synthetic methodologies, [15,16,[53][54][55][56][57][58][59] herein, we report a dendritic magnetic catalyst based on Ni(0) nanoparticles, an inexpensive non-noble metal, for selective hydrogenation of nitro and nitrile compounds in the presence of various reducible substituents such as carboxylic acid, ketone, aldehyde and halogen to the respective amines using NaBH 4 as the reducing agent in the aqueous phase. …”

Section: Introductionmentioning

confidence: 99%

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Chemo‐selective reduction of nitro and nitrile compounds using Ni nanoparticles immobilized on hyperbranched polymer‐functionalized magnetic nanoparticles

Rezaei

Malekzadeh

Poulaei

et al. 2017

Applied Organom Chemis

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The nitro and nitrile groups in aromatic and aliphatic compounds containing various reducible substituents such as carboxylic acid, ketone, aldehyde and halogen are selectively reduced to the corresponding amines in water as a green solvent with excellent yields by employing NaBH 4 in the presence of Fe 3 O 4 @PAMAM/Ni(0)-b-PEG nanocatalyst. The morphology and structural features of the catalyst were characterized using various microscopic and spectroscopic techniques. The designed catalyst system because of it being covered with hydrophilic polymers is soluble in a wide range of solvents (e.g. water and ethanol) and suitable for immobilizing and stabilizing Ni nanoparticles in aqueous mediums. In addition, the catalyst can be easily recovered from a reaction mixture by applying an external magnetic field and can be reused up to six runs without significant loss of activity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemo‐selective reduction of nitro and nitrile compounds using Ni nanoparticles immobilized on hyperbranched polymer‐functionalized magnetic nanoparticles

Rezaei

Malekzadeh

Poulaei

et al. 2017

Applied Organom Chemis

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“…Polyamidoamine dendrimers were grown onto the surface of functionalized MWCNTs, and used to immobilize Pd NPs on the surface of MWCNTs. 319 The hybrid materials were found to be very active in cross-coupling reactions of aryl iodides, bromides and also chlorides with olefinic compounds in Heck reactions with short reaction time duration and high yields. The catalyst can be recycled several times without loss in activity.…”

Section: Carbon-carbon Carbon-oxygen and Carbonnitrogen Coupling Reamentioning

confidence: 99%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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“…According to the above mentioned reasons, and in continuation of our effort to design and synthesize novel catalysts for various reactions [43][44][45][46][47][48][49], herein we report the synthesis of nickel nanoparticles stabilized on rGO-bPEI aerogel in a single step and using the as-obtained material as an efficient catalyst for hydrogen generation from the hydrolysis of NaBH 4 .…”

Section: Introductionmentioning

confidence: 99%

One Pot Synthesis of Nickel Nanoparticles Stabilized on rGO/Polyethyleneimine Aerogel for the Catalytic Hydrogen Generation

2015

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In this study, one pot synthesis of nickel nanoparticles immobilized on reduced graphene oxidebranched polyethyleneimine (NiNPs@rGO-bPEI) aerogel is reported. To produce graphene-based supramolecular hydrogel, bPEI with a high density of amine groups was used as a cross-linking agent. The simultaneous co-reduction of GO and nickel ions was carried out using sodium borohydride (NaBH 4 ). The catalytic activity of the NiNPs@rGO-bPEI aerogel was investigated for hydrogen generation from the hydrolysis of NaBH 4 at room temperature. The effect of various amounts of bPEI as the linking agent on the structure of the aerogel product was investigated. Moreover, the influence of various amounts of nickel loading on the catalytic activity of NiNPs@rGO-bPEI was also studied. The ease of synthesis (only at one step), low cost, being environmentally benign, existence of nitrogen and nickel to have interaction with molecular hydrogen, and also the large surface area are the key features of the synthesized catalyst that makes it suitable for industrial applications.

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Pd nanoparticles immobilized on PAMAM-grafted MWCNTs hybrid materials as new recyclable catalyst for Mizoraki–Heck cross-coupling reactions

Cited by 88 publications

References 70 publications

Chemo‐selective reduction of nitro and nitrile compounds using Ni nanoparticles immobilized on hyperbranched polymer‐functionalized magnetic nanoparticles

Chemo‐selective reduction of nitro and nitrile compounds using Ni nanoparticles immobilized on hyperbranched polymer‐functionalized magnetic nanoparticles

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

One Pot Synthesis of Nickel Nanoparticles Stabilized on rGO/Polyethyleneimine Aerogel for the Catalytic Hydrogen Generation

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