Catalytic efficiency of a sphere-shaped nanosized polyoxomolybdate {Mo132} in the aerobic epoxidation of olefins in water at ambient temperature and pressure in the absence of reducing agent is exploited which resulted good-to-high yields and desired selectivity.
In this work, a novel magnetically recoverable phthalocyanine catalyst was prepared by immobilization of the Cu(II) phthalocyanine-tetrasulfonic acid tetrasodium complex (CuPcS) on the silica coated magnetic nanoparticles (Fe 3 O 4 @SiO 2 , SMNP) via the amine functionality (ASMNP). The epoxidation of olefins and the oxidation of saturated hydrocarbons to the related ketones and also sulfides to the sulfones by an aqueous solution of tetra-n-butylammonium peroxomonosulfate (n-Bu 4 NHSO 5 , TBAOX) were efficiently enhanced with excellent selectivity under the influence of the catalytic activity of the magnetically separable catalyst. Sulfoxides could also be selectively produced in the mixture of water-ethanol, which makes the title methodology a good alternative for both sulfoxide and sulfone production. The separation and recycling of the catalyst and the reduced form of the oxidant were simple, effective and economical in this clean oxidation method. The FT-IR and leaching experiments after seven successive cycles showed that the catalyst was most strongly anchored to the magnetite nanoparticles. † Electronic supplementary information (ESI) available: Optimization results for the oxidation of indane and thioanisole, and the TEM images of CuPcS@ASMNP in aqueous solutions of other oxidants used. See
Atom-efficient and selective oxidation
of sulfides to sulfoxides
and sulfones in water and epoxidation of olefins in ethanol with hydrogen
peroxide catalyzed by Keplerate nanoball polyoxomolybdate {Mo132} under heterogeneous conditions are reported. The reaction
yield and selectivity was affected crucially by catalyst concentration.
A structurally diverse set of sulfides and olefins were transformed
into desired oxidation products regardless of the electronic nature
of the substituents. In spite of the heterogeneous reaction mixtures
throughout the work, no difficulties with reaction progress were noted.
Products were isolated easily from green media, and the catalyst could
be reused several times without any appreciable decrease in catalytic
activity and selectivity. Accelerated reactions under ultrasonic irradiation
did not change the selectivity of the oxidation products.
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