- Diamine compound containing sulfoxide-based bridge chain as well as synthesis method and application of diamine compound containing sulfoxide-based bridge chain
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The invention provides a diamine compound containing a sulfoxide-based bridge chain as well as a synthesis method and application of the diamine compound containing the sulfoxide-based bridge chain. Sulfoxide diamine synthesized by the method contains a sulfoxide-based bridge chain structure. The synthesis method has the characteristics of simple synthetic route, mild reaction conditions, highly available reaction raw material source, low cost, few organic solvent use types, capability of reducing environmental pollution to the greatest extent and the like. The diamine compound provided by theinvention has a sulfoxide group in structure; and in the synthesis of a polymer material, the diamine compound can improve the light transmittance of the material, increase the heat resistance and reduce the dielectric constant and water absorption of the material, and therefore, the diamine compound is suitable for synthesizing flexible transparent polyimide or polyamide and other films.
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- Carbon-supported metal-modified lacunary tungstosilicic polyoxometallates used as catalysts in the selective oxidation of sulfides
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Lacunary tungstosilicic polyoxometallates modified with transition metal ions [SiW11O39M(H2O)]6-, where M = Mn2+, Fe2+, Co2+or Cu2+, were synthesized and supported on activated carbon to obtain the SiW11MC catalysts. The samples were characterized by FT-IR, XRD, N2 adsorption-desorption measurements, and the acidic properties were determined using the isopropanol dehydration test reaction. The activity and selectivity of the catalysts were evaluated in the selective oxidation of a series of sulfides to sulfoxides or sulfone. The reaction was carried out in acetonitrile as solvent using H2O2 35% p/V as a clean oxidant. The conversion values decreased in the following order: SiW11MnC > SiW11FeC > SiW11CuC > SiW11CoC. The catalysts were reused without appreciable loss of their catalytic activity. It was found that the activity of the catalysts decreases in parallel with the increment in the reduction temperature values. The most easily reducible catalyst displayed the highest conversion values. We found a convenient and selective procedure for oxidizing sulfides to sulfoxides or sulfones using aqueous hydrogen peroxide and a catalytic amount of lacunary tungstosilicic polyoxometallates supported on carbon at low temperatures (20-50 °C) in a reasonably short reaction time
- Frenzel, Romina,Sathicq, ángel G.,Blanco, Mirta N.,Romanelli, Gustavo P.,Pizzio, Luis R.
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- PROCESS FOR THE PREPARATION OF SULFONAMIDE COMPOUNDS
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Process for the preparation of known sulfonamides having antibacterial activity applicable on industrial scale, which allows their production in high yields and purity, comprising in particular the step of nucleophile aromatic substitution and oxidation in suitable conditions.
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