Catalytic activity of Keggin heteropolycompounds in the Pechmann reaction

Torviso, Rosario; Mansilla, Daniela; Belizán, A.; Alesso, Elba N.; Moltrasio, Graciela Y.; Vázquez, Patricia; Pizzio, Luis R.; Blanco, Mirta N.; Cáceres, Carmen Victoria

doi:10.1016/j.apcata.2008.01.020

Cited by 39 publications

(22 citation statements)

References 28 publications

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“…However, the 4-methyl-5,6-benzocoumarin yield was low. The use of microwave radiation as power source increases the reaction yield and mainly decreases the reaction time [14].…”

Section: Synthesis Of Heterocyclic Compounds Coumarin Synthesismentioning

confidence: 99%

“…Synthesis of benzimidazole derivatives 7a-7d by cyclization of ortho-phenylenediamine (o-PDA) and acyl chlorides in the presence of a catalytic amount of various type of HPAs including, H 14 [32].…”

Section: Benzimidazole Synthesismentioning

confidence: 99%

“…Recently the result of a study on the use of three type of heteropolyacids including Preyssler, H 14 the type of HPA, temperature and reaction times on the yield of reactions have also been studied (Scheme 21) [67]. O 40 ] have been used for multi-component synthesis of 4-arylaminoquinazolines 24 from the reaction of 2-aminobenzamide, orthoesters and substituted anilines.…”

Section: Synthesis Of 31 5-benzoxadiazepinesmentioning

confidence: 99%

“…Synthesis of some Į-amino nitriles 33a-33j by nucleophilic addition reaction of aldehydes and amines with TMSCN in presence of a catalytic amount of H 14 Recyclability of catalyst with no loss in its activity, simple experimental procedure and product isolation, use of nontoxic, noncrrosive and inexpensive catalyst were the feature of that new protocol to prepare Į-amino nitriles.…”

Section: Synthesis Of į-Amino Nitrilesmentioning

confidence: 99%

“…In another work related to oxidation of alcohol, alfaButyrolactone, alfa-caprolactone and 2-cumaranone were synthesized from related diols, using Preyssler heteropolyacids, H 14 9 Al 3 ) and water as solvents (a small quantity of organic solvents were used as cosolvent for a few substrates) was used for selective oxidation of alcohols to ketones (aldehydes) using 30% H 2 O 2 without any phase-transfer catalyst under mild reaction conditions. The catalyst system allowed easy product/catalyst separation.…”

Section: Alcohol Oxidationmentioning

confidence: 99%

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Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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Heteropolyacids, their salts and polyoxometalates have been used as catalysts in wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions. There have been tremendous and continued efforts to modify the catalytic performance of heteropoly acids such as supporting them on MCM, silica gel, etc. In this review, we have attempted to bring some of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus.

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“…However, the 4-methyl-5,6-benzocoumarin yield was low. The use of microwave radiation as power source increases the reaction yield and mainly decreases the reaction time [14].…”

Section: Synthesis Of Heterocyclic Compounds Coumarin Synthesismentioning

confidence: 99%

Section: Benzimidazole Synthesismentioning

confidence: 99%

Section: Synthesis Of 31 5-benzoxadiazepinesmentioning

confidence: 99%

Section: Synthesis Of į-Amino Nitrilesmentioning

confidence: 99%

Section: Alcohol Oxidationmentioning

confidence: 99%

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Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

View full text Add to dashboard Cite

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Solid Acid Catalysts for Coumarin Synthesis by the Pechmann Reaction: MOFs versus Zeolites

2012

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The catalytic behavior of metal–organic frameworks Cu‐benzene‐1,3,5‐tricarboxylate (CuBTC) and Fe‐benzene‐1,3,5‐tricarboxylate (FeBTC) was investigated in the Pechmann condensation of different phenols (resorcinol, pyrogallol, and naphthol) with ethyl acetoacetate and compared with large‐pore zeolites beta (BEA) and ultrastable Y (USY). Zeolites BEA and USY exhibited high activity in transformations of the most active substrates (resorcinol and pyrogallol) but a low conversion of naphthol was observed. Almost total transformation of naphthol (94–98 % conversion) to the target product was achieved within 24 h of the reaction time over CuBTC and FeBTC. We assume that the regularity in the arrangement of active sites within the framework of CuBTC, which results in the existence of 2 active centers in close proximity, is of critical importance to the transformation of naphthol in the Pechmann reaction that leads to coumarin.

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N‐Doped Carbon Wrapped Polyoxometalate Derived from POM‐IL Hybrid: A Heterogeneous Catalyst for the Synthesis of Coumarin Derivatives under Solvent‐Free Conditions

Ramalingam

Chandhru

Manickam³

et al. 2019

Eur J Inorg Chem

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Vanadium substituted Keggin type polyoxometalate loaded N-doped carbon was prepared from polyoxometalate ionic liquid hybrid by carbonization process. The decomposition of organic part generates various functional groups leaving polyoxometalate part intact. The catalyst was characterized by elemental analysis, FTIR, MAS 13 C NMR, XPS and electron microscopy studies. The presence of carboxylic acids, aromatic and hetero-aromatic groups in the catalyst was confirmed by [a]

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Catalytic activity of Keggin heteropolycompounds in the Pechmann reaction

Cited by 39 publications

References 28 publications

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Solid Acid Catalysts for Coumarin Synthesis by the Pechmann Reaction: MOFs versus Zeolites

N‐Doped Carbon Wrapped Polyoxometalate Derived from POM‐IL Hybrid: A Heterogeneous Catalyst for the Synthesis of Coumarin Derivatives under Solvent‐Free Conditions

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