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RISApplication of tungstophosphric acids as a catalyst in electrophilic addition
study ofApplication of tungstophosphric acids as a catalyst in electrophilic addition
Synthesis and charaterizaion f a new organic-inorganic hbrid material
Heteropolyacids and polyoxometalates (hereafter as POMs) of the transition metals have attracted much recent attention because of their possible application in medicine, catalysis, energy storage, molecular electronics, ceramics and theoretical...
Catalytic Performance of Preyssler Anion in Selective Oximation of Aromatic Aldehydes
Preyssler catalyst, H14[NaP5W30O110], catalyzes the aldoximation of aromatic aldehydes for the synthesis of Z-isomers in conventional manner and under microwave irradiation. both pure acid and silica supported catalysts ...
SYNTHESIS OF ACETYL SALICYLIC ACID BY NANOPREYSSLER’S ANION AS GREEN, ECO-FRIENDLTY AND RECYCLABLE CATALYST
Heteropolyacids (HPAs) have been used as catalysts for the reaction of salicylic acid with acetic anhydride. The performance of different forms of heteropoly acids in the presence of acetic anhydride as acetylating agent for acetylation of salicylic...
NANOPREYSSLER’S ANION AS HETEROGENEOUS AND RECYCLABLE CATALYSTS FOR THE SYNTHESIS OF ACETYL SALICYLIC ACID
Synthesis of aspirin via O-acetylation of salicylic acid in the presence of heteropoly acids has been investigated in order to contribute toward clean technology, which is the most important need of the society. HPAs have ...
Keggin Heteropolyacid Catalyzed Synthesis of Isoxazolo-[5,4-d] pyrimidine-4,6(5H,7H)-diones at room temperature
Isoxazolo[5,4-d]pyrimidine-4,6(5H,7H) diones 2a-2f have been synthesized from the reaction of ethyl 5-amino-3-methyl-4-isoxazole carboxylate(1) with aryl isocyanates in the presence of keggin heteropolyacid H3[PW12O40] as a green solid acid catalyst...
Water as an efficient solvent for oxygenation transformations with 34% hydrogen peroxide catalyzed by some heteropolyoxometalates
Résumé / Abstract
A highly efficient, selective, fast, and cheap protocol is developed for oxidation of aromatic amines and alcohols utilizing 34% hydrogen peroxide in water catalyzed by some W- and Mo-based ...
SILICA-SUPPORTED KEGGIN NANO PARTICLES AS A CATALYST FOR THE SYNTHESIS OF ACETYL SALICYLIC ACID
in the presence of acetic anhydride as acetylating agent for acetylation of salicylic acid was compared.The heteropolyacids show higher activity compared with H2SO4....
Catalytic Application of Some Heteropolyacid Compounds in Esterification Reaction
In the present study, initially preparation of some heteropolyacids such as H3[PMo12O40], H4[SiW12O40], H6[P2W18O62] and H14[NaP5W30O110] were investigated....
Preyssler s anion, [NAP5W30O110] 14-, as an efficient catalyst for the selective synthesis of geminal diacetates
The highlyselective catalytic synthesis of gem-bis( acyloxy)-alkanes has been studied using preyssler catalyst....