Selective oxidation of alcohols and aldehydes with hydrogen peroxide catalyzed by methyltrioctylammonium tetrakis(oxodiperoxotungsto)phosphate(3-) under two-phase conditions

Modern Oxidation of Alcohols Using Environmentally Benign Oxidants

“…(5.25)). Molybdenum-and tungsten-containing heteropolyanions are also effective catalysts for alcohol oxidations with H 2 O 2 [134][135][136]. For example, H 3 PMo 12 O 40 or H 3 PW 12 O 40 , in combination with cetylpyridinium chloride as a phase transfer agent, were shown by Ishii and coworkers [137] to be effective catalysts for alcohol oxidations with H 2 O 2 in a biphasic, chloroform/water system.…”

Self-Assembled Complexes of Non-cross-linked Amphiphilic Polymeric Ligands with Inorganic Species: Highly Active and Reusable Solid-Phase Polymeric Catalysts

“…H 2 O 2 under the organic solvent-free conditions was examined. [30][31][32][33][34][35][36][37][38][39][40][41][42] We were pleased to find that PWAA showed a very high catalytic activity on epoxidation. In the presence of 2.7ϫ10…”

Another Example of the Instability of a Keggin‐Type Heteropolyanion in the Presence of Aqueous Hydrogen Peroxide: From [AsW12O40]3– to Low‐Nuclearity Oxoperoxotungstates – Crystal Structure of [(nHex)4N]3[AsO4{W2O2(μ‐O2)2(O2)2}2]

“…Although tetra-n-butylammonium and bis(triphenylphosphoranylidene) ammonium salts were prepared in powder or microcrystalline forms, only the tetra-n-hexylammonium salts gave single crystals of an appropriate size from acetonitrile solutions in the presence of a slight excess of hydrogen peroxide, otherwise Keggin salts are formed. Compound 6 was also synthesised from "Na 2 H[AsW 12 3-salt (vide supra, 0.5 mmol, 1.57 g) in water (1 mL). After 30 min of stirring at room temperature, an aqueous solution of tetra-n-butylammonium chloride (3 mL, 1.6 mmol, 0.45 g) was slowly added.…”

“…As-O stretches (see Table 2). For "Na 3 [AsW 12 O 40 ]·nH 2 O" [51] (reformulated as Na 2 H-[AsW 12 O 40 ]·NaCl·30H 2 O -see Experimental Section), an infrared band located at 911 cm -1 is attributed to the ν asym (As-O) vibration. [51] Two infrared bands at 892 and 875 cm -1 are also tentatively attributed to the ν(AsO 4 ) stretches of the arsenato-containing tetranuclear species.…”

“…Salts of the anion have been prepared by several groups; [11][12][41][42][43] despite many attempts to show that 1, 2 and 6 are isomorphous, it was previously difficult to isolate single crystals of 6 suitable for X-ray measurements. The profiles of the Raman and infrared spectra of 6 are compared with those of tetran-butylammonium (µ-hydrogenoarsenato)bis(µ-peroxo)bis-(oxoperoxotungstate)(2-) (4) [14] and with those of the methylarsenato analogue (5).…”