Preyssler-type heteropoly acid: A new, mild and efficient catalyst for protection of carbonyl compounds

Three molybdophosphates based on Strandberg-type anions and Zn(ii)-H2biim/H2O subunits: syntheses, structures and catalytic properties

“…It is well known that POMs can be used as photocatalysts 6 and electrocatalysts, 7 and they are most widely used as catalysts in organic synthesis, such as esterification reaction, 8 oxidation reaction 9 and protection of carbonyl compounds. 10 Protection of carbonyls as acetals or ketals is one of the most important organic reactions, and there are many methods reported in the literature. 11,12 In 2011, Rahimizadeh's group reported that the Preyssler-type POM is a mild and efficient catalyst for the protection of carbonyl compounds.…”

“…11,12 In 2011, Rahimizadeh's group reported that the Preyssler-type POM is a mild and efficient catalyst for the protection of carbonyl compounds. 10 To the best of our knowledge, there is no report on the catalytic activity of the Strandberg POM used as a catalyst in organic synthesis. In addition, 2,2′-biimidazole, as a polydentate ligand, is able to coordinate to transition metals with three reversible types: neutral (H 2 biim), monoanion (Hbiim − ), and dianion (biim 2− ) types, 13 but few compounds involving transition metals, H 2 biim ligands, and polyoxoanions have been reported.…”

Mg(HSO4)2/SiO2 as a Highly Efficient Catalyst for the Green Preparation of 2-Aryl-1,3-Dioxalanes/Dioxanes and Linear Acetals

“…These problems remain a crucial challenge to organic chemists. A suitable method for solving this problem is the acetalization of carbonyl functions since acetals and 1,3-dioxanes are stable under neutral and basic conditions [7,8]. Besides the interest in acetals as protecting groups, many of them can serve for fragrances in cosmetics, pharmaceuticals, detergents, lacquer industries, and applications as food and beverage additives [9][10][11].…”

Two Organic–Inorganic Hybrid 3D {P5W30}‐Based Heteropolyoxotungstates with Transition‐Metal/Ln–Carboxylate–Ln Connectors

“…[25] In 2011, the {P 5 W 30 }-type POM as a mild and efficient catalyst was applied to protect the carbonyl compounds. [26] In 2012, a family of mononuclear lanthanoid complexes, [LnP 5 W 30 O 110 ] 12À (Ln = Tb III /Dy III /Ho III /Er III /Tm III / Yb III ), based on the {P 5 W 30 } cluster were shown to exhibit single-molecule magnetic (SMM) behavior. [3f] To sum up, the above-mentioned {P 5 W 30 }-type POMs in the literature are mainly metal-cation-encapsulated Preyssler complexes, whereas Preysslers metal-organic-complex-modified or -extended structures have rarely been reported (see the Supporting Information).…”

“…The {P 5 W 30 } anion shows excellent electrochromic performance in terms of optical contrast, stability, and reversibility 25. In 2011, the {P 5 W 30 }‐type POM as a mild and efficient catalyst was applied to protect the carbonyl compounds 26. In 2012, a family of mononuclear lanthanoid complexes, [LnP 5 W 30 O 110 ] 12− (Ln=Tb III /Dy III /Ho III /Er III /Tm III /Yb III ), based on the {P 5 W 30 } cluster were shown to exhibit single‐molecule magnetic (SMM) behavior 3f.…”