Functionalized mesoporous dendritic silica hybrids as base catalysts with volatile organic compound elimination ability

Kapoor, Mahendra P.; Kasama, Yuuki; Yokoyama, Takuji; Yanagi, Masaaki; Inagaki, Shinji; Nanbu, Hironobu; Juneja, Lekh Raj

doi:10.1039/b610684f

Cited by 31 publications

(21 citation statements)

References 28 publications

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“…Recently, Portnoy and co-workers reported a polymersupported aryl ether dendrimer-based organocatalyst for aldol reactions. [9] Kapoor et al showed that PAMAM dendri-mers attached to silica supports can act as base catalysts for Knoevenagel condensations, [10] but the catalytic activity was checked only for one set of substrates and the reactions required longer periods of time and high temperatures in order to provide good yields. To the best of our knowledge, the use of polymer-supported PAMAM dendrimers as recyclable base catalysts has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

First Example of Organocatalysis by Polystyrene‐Supported PAMAM Dendrimers: Highly Efficient and Reusable Catalyst for Knoevenagel Condensations

Krishnan

Sreekumar

2008

Eur J Org Chem

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This paper describes the first use of polystyrene‐supported poly(amidoamine) (PAMAM) dendrimers as heterogeneous basic organocatalysts for carbon–carbon bond formation. Polystyrene‐supported PAMAM dendrimers of first, second and third generations have been used as reusable base catalysts in Knoevenagel condensations of carbonyl compounds with active methylene compounds. The reactions proceed in short periods of time and with 100 % selectivity. This novel catalyst eliminates the use of aromatic and halogenated solvents, as well as complex purification processes. The catalysts can be recycled ten times.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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Section: Introductionmentioning

confidence: 99%

First Example of Organocatalysis by Polystyrene‐Supported PAMAM Dendrimers: Highly Efficient and Reusable Catalyst for Knoevenagel Condensations

Krishnan

Sreekumar

2008

Eur J Org Chem

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“…It is well known that mesoporous materials as host of dendritic functionalities usually provides high surface area for improved catalytic applications due to easier accessibility of functionalized dendritic sites. Owing to their easily tunable surface properties (hydrophilicity/ hydrophobicity), it is possible to suppress potential competitive side reactions and easily recyclable [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have created periodic functionalized polyamidoamine dendritic mesoporous silicas with a high density of tertiary amino group. The dendrimers were grown up to second generation (2G) inside the mesoporous channels of benzene bridged periodic mesoporous silicas with crystallike pore walls as well as mesoporous materials with amorphous pore wall structure [23].…”

Section: Introductionmentioning

confidence: 99%

Catalysis by Mesoporous Dendrimers

et al. 2009

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The present study reports the divergent synthesis, characterization and catalytic properties of different generation of triazine based aromatic amine dendritic mesoporous silicas derived via a stepwise functionalization of mesoporous silica substrates of different pore sizes with 2,4,6 tricholorotriazine and ethylene diamine. Mesoporous dendritic silicas up to second generation (2G) are grown in side the channels of mesoporous silica materials with 4 and 7 nm pore sizes. The catalytic properties of resulted dendritic materials in Knoevenagel condensation reaction were compared to the aliphatic polyamidoamine dendrimers that are also grown up to second generation (2G) inside the mesoporous channels. The reusability study of both aliphatic and aromatic dendritic mesoporous silica systems is also compared.

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“…After the synthesis, to calculate the amount of free primary amines in the periphery of the dendrimers, the titration method was used. [62] Typically, 0.1 g of Fe 3 O 4 @PAMAM nanoparticles was suspended in 20 ml of 0.01 M HCl aqueous solution and stirred at room temperature for 24 h. The particles were then collected magnetically and washed well with distilled water. The filtrate and washings were collected.…”

Section: Preparation Of Fe 3 O 4 @Pamammentioning

confidence: 99%

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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Functionalized mesoporous dendritic silica hybrids as base catalysts with volatile organic compound elimination ability

Cited by 31 publications

References 28 publications

First Example of Organocatalysis by Polystyrene‐Supported PAMAM Dendrimers: Highly Efficient and Reusable Catalyst for Knoevenagel Condensations

First Example of Organocatalysis by Polystyrene‐Supported PAMAM Dendrimers: Highly Efficient and Reusable Catalyst for Knoevenagel Condensations

Catalysis by Mesoporous Dendrimers

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

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