Baochun Ma

Magnetically separable polyoxometalate catalyst for the oxidation of dibenzothiophene with H2O2.

Two types of polyoxometalate-functionalized magnetic nanoparticles catalysts consisting of H(3)PW(12)O(40) supported on surface-modified Fe(3)O(4) magnetite nanoparticles were prepared using an easy synthetic route and successfully applied for the oxidation of dibenzothiophene. The magnetic catalysts showed a catalytic performance in the oxidation of dibenzothiophene in acetonitrile with hydrogen peroxide, and high conversions were obtained. The catalysts could be easily separated from the reaction solution by applying an external magnetic field and recycled several times.

[π-C5H5N(CH2)15CH3]3[PW4O32]/H2O2/ethyl acetate/alkenes: a recyclable and environmentally benign alkenes epoxidation catalytic system

The epoxidation of alkenes was successfully catalyzed by a recyclable and environmentally benign catalytic system: [π-C5H5N(CH2)15CH3]3[PW4O32]/H2O2/ethyl acetate/olefin

Mild and recyclable catalytic oxidation of pyridines to N-oxides with H2O2 in water mediated by a vanadium-substituted polyoxometalate

A vanadium-substituted polyoxometalate, K6[PW9V3O40]·4H2O, was used as a recyclable and effective catalyst for the oxidation of pyridines. The reactions were successfully conducted in water under mild conditions. The catalyst could be easily recovered and reused.

Synthesis of Epoxides Catalyzed by a Halide-Free Reaction-Controlled Phase-Transfer Catalytic System: [(CH3(CH2)17)2 N(CH3)2]3[PW4O32]/H2O2/Dioxan/Olefin

The epoxidation of alkenes was successfully catalyzed by a recyclable catalytic system: [(CH3(CH2)17)2N(CH3)2]3[PW4O32]/H2O2/dioxan/olefin. This new catalytic system is not only capable of catalyzing homogeneous epoxidation of alkenes with a unique reaction-controlled phase-transfer character, but also avoids the use of chlorinated solvents. The reactions were conducted in a biphasic mixture of aqueous H2O2/dioxan, and many kinds of alkenes could be efficiently converted to the corresponding epoxides in high yields. Both new and used [(CH3(CH2)17)2N(CH3)2]3[PW4O32] catalyst was characterized by 31P magic angle spin NMR, and IR.

The oxidation of pyridines catalyzed by surfactant-encapsulated polyoxometalate [(C18H37)2(CH3)2N]8[HBW11O39] with the temperature-responsive property of solubility

Temperature-responsive characterization of solubility based on a surfactant-encapsulated polyoxometalate ([(C18H37)2(CH3)2N]8[HBW11O39]) in tert-butyl alcohol was described and used in catalytic oxidation of pyridines. The catalyst could be recovered and reused several times by controlling the temperature.

Lacunary Derivative [HPW9O34]8− as Reusable and Active Catalyst for Alcohol Oxidation in Water

Abstract An effective and reusable catalytic system for the oxidation of alcohols was developed based on ▵-Na8HPW9O34. The oxidation was conducted in water using hydrogen peroxide as oxidant. Good yields of ketones were obtained in oxidation of secondary alcohols, and the catalyst was recycled 10 times without obvious loss in activity. GRAPHICAL ABSTRACT

Sulfamic Acid as A Cost-Effective Catalyst for Synthesis of α-Acyloxyacrylate Esters as Candidate Monomers for Biobased Polymers by Acylation of Pyruvate Esters

Abstract Sulfamic acid was used as an efficient catalyst and green alternative for metal-containing acidic material to promote the acylation of pyruvate esters to produce α-acyloxyacrylate esters, which were candidate monomers for biobased polymers. Polymers from these monomers were useful materials for bio-based plastics, which showed high heat resistance and transparency. A series of α-acyloxyacrylate esters were converted from pyruvate esters by using sulfamic acid as a catalyst and good yields were obtained. The reaction in the presence of the sulfamic acid catalyst was carried out in the liquid phase and showed greater productivity than synthesis with a conventional liquid inorganic acid. GRAPHICAL ABSTRACT