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Thiols and disulfides are important in both biological1 and chemical processes.2 Disulfides are useful reagents in organic synthesis2 and essential moieties of biologically active compounds for peptide and protein stabilization.1 As disulfides are relatively more stable toward organic reactions, such as oxidation, alkylation, and acylation, compared to the corresponding free thiols, the thiol group can conveniently be protected as a disulfide. Besides, there are a large number of commercially available thiols and the interconversion between thiols and disulfides is easy.3 These aspects are responsible for the continuous interest in the development of new, selective, and efficient protocols for the preparation of disulfides. 2,4,5Recently reported procedures to obtain symmetrical disulfides involve the use of anhydrous potassium phosphate,4a potassium permanganate,4b molecular bromine supported on silica gel,4c N-phenyltriazolinedione,4d VO(acac)2,4e trichloroisocyanuric acid,4f nitric acid,4g 1,3-dibromo-5,5-dimethylhydantoin,4h basic alumina,4i CsF¨CCelite,4j and montmorillonite K10.4k Additionally, cleaner protocols under solvent-free conditions were described.4d,6 These methods use N-phenyltriazolinedione,4d pyridinium chlorochromate, 6a 1,3-dibromo-5,5-dimethylhydantoin,6b SO2Cl2,6c trichloronitromethane, 6d KMnO4/MnO2,6e KMnO4 supported on montmorillonite K10,6f catalytic amount of iodine, and CeCl37H2O in graphite,6g and KF/Al2O3 6h as catalysts. Thus, there is still an attention in developing green methods that would produce the desirable disulfides in high yields. In this way, ionic liquids (ILs) constitute an interesting alternative for this reaction. Because product isolation or catalyst recycling is very easy in ILs and, in some cases, rate accelerations |
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תÍäΪÄãÏàÓö: ½ð±Ò+5, ·ÒëEPI+1, ¡ïÓаïÖú 2012-05-03 18:05:34
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תÍäΪÄãÏàÓö: ½ð±Ò+5, ·ÒëEPI+1, ¡ïÓаïÖú 2012-05-03 18:05:34
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sltmac: ½ð±Ò-10, ·ÒëEPI-1, Î¥¹æ´æµµ, »úÆ÷·Òë 2012-05-20 08:56:01
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