H5PW10V2O40/Pip-SBA-15: A novel reusable organic–inorganic hybrid material as potent Lewis acid catalyst for one-pot solvent-free synthesis of 3,4-dihydropyrimidinones

Tayebee, Reza; Amini, Mostafa M.; Ghadamgahi, Malihe; Armaghan, Mahsa

doi:10.1016/j.molcata.2012.10.004

Cited by 63 publications

(20 citation statements)

References 38 publications

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“…Yet, several reports of heating 1, 2, and 3 in the absence of exogenous catalyst in acetonitrile, 49,50 ethanol, 51 octane, 52 ethylene glycol, 53 or neat fails to produce Biginelli product 4 (Scheme 3b). 54 Additionally, we performed an uncatalyzed, room temperature reaction that only produced trace amounts of 4 aer 48 hours of stirring (see ESI † for details).…”

Section: Rate Acceleration Relative To Bulk-phase Control Reactionsmentioning

confidence: 99%

A microdroplet-accelerated Biginelli reaction: mechanisms and separation of isomers using IMS-MS

et al. 2019

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Section: Rate Acceleration Relative To Bulk-phase Control Reactionsmentioning

confidence: 99%

A microdroplet-accelerated Biginelli reaction: mechanisms and separation of isomers using IMS-MS

et al. 2019

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“…The conversion and selectivity were calculated as follows: Figure 1 shows FT-IR spectra of the pristine SBA-15, ZrSBA-15, PEHA/ZrSBA-15, HPW/ PEHA/ZrSBA-15 (cat-3) and cat-3/5t. The adsorption bands at 1079, 808 and 469 cm -1 were observed for SBA-15, which can be assigned to asymmetric stretching, symmetric stretching and bending modes of Si-O-Si, respectively [30]. The typical bands of 1632 and 3424 cm -1 were related to the stretching vibration of silanol groups and the H-O-H stretching mode of physisorbed water [31].…”

Section: Catalytic Testsmentioning

confidence: 94%

Interplay between zirconium addition and morphology/catalytic performance of HPW/PEHA/SBA-15 composites towards selective oxidation of benzyl alcohol

et al. 2015

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A series of HPW/PEHA/ZrSBA-15 catalysts with varied Zr contents were synthesized and used for the selective oxidation reaction of benzyl alcohol. The catalysts were characterized by N 2 adsorption-desorption, XRD, SEM, TEM, XPS, FT-IR and ICP-AES analysis techniques. It was found that, through simply tuning the initial molar ratios of Zr/Si, both the morphology and catalytic performance of resultant catalysts can be tailored. More interestingly, the incorporation of zirconium ions, which can endow the ordered framework with enhanced acidity, can effectively stabilize loaded pentaethylenehexamine (PEHA) and facilitate a higher dispersion and attraction of HPW clusters. By carefully screening the catalytic results of the selective oxidation of benzyl alcohol, an optimal value of Zr/Si molar ratio was found to be 0.05, under which platelet ZrSBA-15 with ordered framework can be facilely obtained, leading to a maximum catalytic activity with negligible loss in selectivity and conversion even after five times of recycling test.

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“…Cobalt nitrate hexahydrate (99%), 2‐aminobenzimidazole (98%) and phosphotungstic acid were purchased from Merck and used as received without further purification. All synthesized dihydropyrimidinones were characterized by comparison of their spectral and physical data with those reported in the literature . Progress of the reactions was monitored by TLC.…”

Section: Methodsmentioning

confidence: 99%

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

Tayebee

Abdizadeh

Erfaninia

et al. 2019

Applied Organom Chemis

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Phosphotungstic acid (H 3 PW 12 O 40 , PTA) supported on ZIF-9(NH 2 ) was synthesized for the first time and performed as an effective and environmental friendly catalyst in the one-pot three component Biginelli condensation of different substituted benzaldehydes with ethyl acetoacetate and urea to afford the corresponding 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions. ZIF-9(NH 2 ) and the prepared nanocatalyst PTA@ZIF-9(NH 2 ) were characterized by XRD, FESEM, TEM, EDX, BET, AAS, TGA, UV-Vis, and FT-IR. After reaction, the nanocatalyst can be easily separated from the reaction mixture by centrifuge and the recovered catalyst can be reused for at least five times with a 14% reduction in yield after the fifth run. This study showed that ZIF-9(NH 2 ) can be utilized as a promising support for PTA and developed a highly active, stable and reusable heterogeneous catalyst under easy reaction condition in the multi-component organic synthesis.

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H5PW10V2O40/Pip-SBA-15: A novel reusable organic–inorganic hybrid material as potent Lewis acid catalyst for one-pot solvent-free synthesis of 3,4-dihydropyrimidinones

Cited by 63 publications

References 38 publications

A microdroplet-accelerated Biginelli reaction: mechanisms and separation of isomers using IMS-MS

A microdroplet-accelerated Biginelli reaction: mechanisms and separation of isomers using IMS-MS

Interplay between zirconium addition and morphology/catalytic performance of HPW/PEHA/SBA-15 composites towards selective oxidation of benzyl alcohol

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

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