Novel oxidation of aromatic aldehydes catalyzed by Preyssler's anion, [NaP5W30O110]14-

Abstract

]) were used and had their activity compared with those of some Keggin structures. Our data indicate that Sodium30-tungsto pentaphosphate, the so-called Preyssler's anion, with high hydrolytic (pH=0-12) and thermal stability is the best catalyst with high yield and good selectivity. Under microwave irradiation, this polyanion supported on SiO 2 was found to be an excellent catalyst for aldehydes with low loss factor in 1-2 min (the loss factor is a measure of the ability of the material to dissipate energy). The effects of various parameters, including catalyst type, nature of the substituent in the aldehyde and temperature, on the yield of the carboxylic acids were studied.

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

“…Under microwave irradiation, this polyanion supported on SiO 2 was found to be an excellent catalyst for aldehydes with low loss factor in 1-2 min (the loss factor is a measure of the ability of the material to dissipate energy). The effects of various parameters, including catalyst type, nature of the substituent in the aldehyde and temperature, on the yield of the carboxylic acids were studied (Table 22) [145].…”

A catalytic method for synthesis of γ-butyrolactone, ɛ-caprolactone and 2-cumaranone in the presence of Preyssler's anion, [NaP5W30O110]14−, as a green and reusable catalyst

“…Recently, we have been exploring the application of this catalyst and have found that this catalyst in different forms are very effective in catalytic processes [30][31][32][33].…”

H14[NaP5W29MoO110]: a Novel and Useful Catalyst for Aminolysis of Epoxides with Amines under Solvent‐Free Conditions

“…20 The free acid was prepared by passage a solution of the potassium salt in water through a column of Dowex 50wx8 in the H ＋ form and evaporation of the elute to dryness under vacuum. 20 Molybdenum substituted Preyssler heteropolyanion, H 14 P 5 Mo, was prepared as follow: 2.8 g (0.169 mol) Na 2 WO 4 •2H 2 O and 2 g (0.008 mol) of Na 2 MoO 4 •2H 2 O were dissolved in 35 mL of water and mixed at 60 ℃ for 30 min. Then this solution was cooled to room temperature, and 25 mL of concentrated phosphoric acid were added.…”