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

Ruthenium/1,1′‐Bis(diphenylphosphino)ferrocene‐Catalysed Oppenauer Oxidation of Alcohols and Lactonisation of α,ω‐Diols using Methyl Isobutyl Ketone as Oxidant

“…Bamoharram and co-workers reported the use of polyoxometalates as catalysts with H 2 O 2 in chlorinated solvents (98% yield). [10] Park et al used Shvos catalyst and CHCl 3 as unusual oxidant (90% yield). [11] Khusnutdinov and co-workers used several manganese and vanadium salts as catalysts and CCl 4 as oxidant (82% yield).…”

Acetylation of p-Aminophenol by Preyssler's anion [NaP5W30O110]14-, [NaP5 W29MoO110]14- with green condition at room temperature

“…Heteropolyacid with tungsten atom shows higher acidity than a molybdenum analogue 15 . When tungsten is replaced by molybdenum, the negative charge on the oxygen atoms increases, which leads to a decrease in acidity 15,16 . In homogeneous conditions higher activity of Preyssler is attributed to the higher number of acidic protons.…”

Heteropolyacids as an efficient and reusable catalytic system for the regiospecific nitration of phenols with metal nitrates

“…Recently, H 3 PW 12 O 40 was used on the nitration of phenols by Fe(NO 3 ) 3 .9H 2 O in low yields [42] and in our lab, we used nitric acid as a strongly acidic media in the presence of HPAs to the nitration of phenols [43]. Because of our studies towards the development of new routes to the synthesis of heterocyclic compounds [44][45][46][47][48][49] …”