• Title/Summary/Keyword: chemoselective

Search Result 56, Processing Time 0.021 seconds

Metalloporphyrin-Catalyzed Chemoselective Oxidation of Sulfides with Polyvinylpyrrolidone-Supported Hydrogen Peroxide: Simple Catalytic System for Selective Oxidation of Sulfides to Sulfoxides

  • Zakavi, Saeed;Abasi, Azam;Pourali, Ali Reza;Talebzadeh, Sadegh
    • Bulletin of the Korean Chemical Society
    • /
    • v.33 no.1
    • /
    • pp.35-38
    • /
    • 2012

  • Room temperature oxidation of organic sulfides with polyvinylpyrrolidone-supported hydrogen peroxide (PVP-$H_2O_2$) 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.

  • https://doi.org/10.5012/bkcs.2012.33.1.35 인용 PDF KSCI

The First Report on Chemoselective Biguanide-Catalyzed Henry Reaction under Neat Conditions

  • Alizadeh, Abdolhamid;Khodaei, Mohammad M.;Abdi, Gisya;Kordestani, Davood
    • Bulletin of the Korean Chemical Society
    • /
    • v.33 no.11
    • /
    • pp.3640-3644
    • /
    • 2012

  • An efficient synthetic method for direct Henry reaction catalyzed by a biguanide; namely metformin, as an organosuper-base, between a variety of aromatic and aliphatic aldehydes and nitromethane under neat conditions has been developed. Convenient procedure for removal of the catalyst, chemoselective acquiring of ${\beta}$-nitroalcohols as predominant products, as far as possible short reaction time with excellent conversions are advantages of the developed protocol.

  • https://doi.org/10.5012/bkcs.2012.33.11.3640 인용 PDF KSCI