Copper(II) ion exchanged AlSBA-15: A versatile catalyst for intermolecular hydroamination of terminal alkynes with aromatic amines

Shanbhag, Ganapati V.; Joseph, Trissa; Halligudi, S.B.

doi:10.1016/j.jcat.2007.06.007

Cited by 49 publications

(14 citation statements)

References 38 publications

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“…Mesoporous SBA-15 shows high surface area of 808 m 2 /g. Incorporation of aluminium in the silica framework leads to reduction in surface area which may be due to presence of extra framework species, these results are consistent with earlier findings 44. Among the microporous catalysts, the order of the surface area values is H-beta (700 m 2 g −1 ), H-mordenite (490 m 2 g −1 ), H-MCM-22 (409 m 2 g −1 ), H-ZSM-5 (360 m 2 g −1 ), SAPO-5 (330 m 2 g −1 ), and AlPO 4 -5 (320 m 2 g −1 ).…”

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confidence: 93%

Novel catalysts for valorization of biomass to value-added chemicals and fuels

et al. 2014

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Key furan compounds such as 5-hydroxymethylfurfural (HMF), 2,5-furandicarboxylic acid (FDCA) and 2,5-dimethylfuran (DMF) were synthesized from renewable feedstocks. Dehydration of fructose was carried out in biphasic conditions employing several solid acid catalysts by targeting selective formation of HMF. Its selectivity is linearly dependent on total acidity clearly revealing that lower acidity favours selective formation of HMF. Oxidation and hydrogenolysis of HMF has been explored using 2 wt% Ru-K-OMS-2. The catalysts used for each transformation were subjected to detailed characterization using XRD, BET surface area, temperature-programmed desorption and transmission electron microscopy. The effect of various reaction parameters was also investigated for obtaining high yields of desired chemical intermediates. High FDCA yields of 93.4 mol% and 66 mol% were achieved in alkaline and base-free conditions, respectively. The 2 wt% Ru-K-OMS-2 is a versatile catalyst as it also catalyses HMF hydrogenolysis giving 33 mol% of DMF. Thus, utility of various novel materials as catalysts has been demonstrated in the multistep transformations of hexoses to furan-based fuels and chemicals.

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Novel catalysts for valorization of biomass to value-added chemicals and fuels

et al. 2014

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“…The reaction mixture was then stirred for 0. [44,48]. CuSTA/SBA-15 and CuSTA/ AlSBA-15 were prepared by wet impregnation method.…”

Section: Hpamentioning

confidence: 99%

“…In earlier studies, we have reported metal exchanged montmorillonite clays and CuAlSBA-15 for intermolecular hydroamination of terminal alkynes with aromatic amines [41][42][43][44]. The present work deals with the application of copper salts of heteropoly acids as heterogeneous catalysts in the liquid-phase intra and intermolecular hydroamination reactions to synthesize imines.…”

Section: Introductionmentioning

confidence: 98%

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Shanbhag¹,

Palraj²,

Halligudi³

2008

TOOCJ

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Abstract:The hydroamination reaction offers a very attractive route for the synthesis of alkylated amines and their derivatives with no byproduct formation. Heterogeneous intermolecular hydroamination reactions of alkynes with aromatic amines using different inexpensive copper salts of hetropolyacid catalysts were investigated. Among heteropoly salts, copper salts of silicotungstic acid showed highest activity. Reactivity of aromatic amines increased with increase in its basicity. Acidity in heterogeneous catalyst can act as promoter in hydroamination of alkynes.

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“…SBA-15 and AlSBA-15 (Si/Al = 17) were synthesized as reported elsewhere [44,48]. CuSTA/SBA-15 and CuSTA/ AlSBA-15 were prepared by wet impregnation method.…”

Section: Preparation Of 20 Wt% Custa/sba-15 and 20 Wt% Cu-sta/alsba-15mentioning

confidence: 99%

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Shanbhag¹,

Palraj²,

Halligudi³

2008

TOOCJ

View full text Add to dashboard Cite

show abstract

Copper(II) ion exchanged AlSBA-15: A versatile catalyst for intermolecular hydroamination of terminal alkynes with aromatic amines

Cited by 49 publications

References 38 publications

Novel catalysts for valorization of biomass to value-added chemicals and fuels

Novel catalysts for valorization of biomass to value-added chemicals and fuels

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

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