A new polymeric catalyst was prepared by supporting GaCl3 on cross-linked polyvinylpyrrolidone (GaCl3/ PVP). This catalyst was employed for efficient and regioselective ring-opening reaction of epoxides by various alcohols under solvent-free conditions at room temperature. In our procedure, this heterogeneous catalyst was used at neutral and mild reaction conditions to afford high yields of β-alkoxy alcohols. Also, regioselective conversion of epoxides to β-azidohydrines was accomplished by sodium azide in MeOH in the presence of GaCl3/PVP at room temperature. GaCl3/PVP is a non-hygroscopic and recoverable catalyst and is easily separated from reaction mixture by a simple filtration and re-used repeatedly. Also, this catalyst has good handling and can be stored for long time without any reducing of its reactivity.
3-Nitrophthalic anhydride was reacted with urea and cobalt salt in nitrobenzene under N2 at 185°C and cobalttetraanitrophthalocyanine (CoTNP) was produced. Cobalt-tetraaminophthalocyanine (CoTAP) was produced by reduction of CoTNP caused by Sodium borohydride under N2(g). CoTAP and chloromethylpolystyrene was refluxed in nitrobenzene or DMF at 180°C for 12h. The mixture was cooled down to reach the room temperature and then solvent removed and the resulting precipitate was washed with water to remove excess CoTAP, and dried it to get a light green solid (CoTAP-linked-polymer).
AUTHOR KEYWORDS: Cobaltetraminophthalocyanine; CoTAP; Phthalocyanines; Phthalocyanines linked polymer INDEX KEYWORDS: 3 nitronaphthalic anhydride; chemical compound; chloromethylpolyestyrene; cobalt derivative; nitrobenzene; phthalocyanine derivative; polymer; sodium borohydride; solvent; tetraaminotrophthalocyanine; tetraanitrophthalocyanine; unclassified drug; urea; water, article; catalyst; chemical reaction; chemical structure; controlled study; cooling; room temperature
Room temperature oxidation of organic sulfides with polyvinylpyrrolidone- supported hydrogen peroxide (PVP-H2O2) in the presence of Mn(III) complexes of meso-tetraphenylporphyrin, Mn(TPP)X (X = OCN, SCN, OAc, Cl) and imidazole (ImH) leads to the highly chemoselective (ca. 90%) oxidation of sulfides to the corresponding sulfoxide. The efficiency of reaction has been shown to be influenced by different reaction parameters such as the nature of counterion (X) and solvent as well as the molar ratio of reactants. Using Mn(TPP)OCN and ImH in 1:15 molar ratio and acetone as the solvent leads to the efficient oxidation of different sulfides.
AUTHOR KEYWORDS: Mn(III)-meso-tetraphenylporphyrin; Oxidation of sulfides; Sulfoxide INDEX KEYWORDS: Acetone; Catalytic oxidation; Chlorine compounds; Hydrogen peroxide; Manganese; Peroxides; Sulfur compounds, Chemoselective oxidation; Efficiency of reaction; Mn-meso-tetraphenylporphyrin(III); Oxidation of sulfides; Poly vinyl pyrrolidone; Room temperature oxidation; Sulfoxide; Tetraphenyl porphyrins, Oxidation PUBLISHER: Korean Chemical Society
Alkyl nitrites were prepared in good to excellent yields by treatment of alcohols and thiols with triphenylphosphine/2,3-dichloro-5,6- dicyanobenzoquinone/Bu4NNO2 in acetonitrile. This method is highly selective for the conversion of primary alcohols to alkyl nitrites in the presence of secondary and tertiary alcohols and thiols.
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