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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
Mally89: ½ð±Ò+1 2012-05-17 13:47:34
sltmac: ½ð±Ò-10, ·­ÒëEPI-1, Î¥¹æ´æµµ, »úÆ÷·­Òë 2012-05-20 08:56:01
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еġ¢ Ñ¡ÔñÐԵĺ͸ßЧЭÒé¶þÁò»¯ÎïµÄ×¼±¸¡£
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ÎÞÈܼÁÌõ¼þϵÄÇå½àЭÒé±» described.4d,6
ÕâЩ·½·¨Ê¹ÓÃßÁà¤ÂȸõËáÑÎ 4 d N-phenyltriazolinedione
6a 1£¬3-¶þäå-5£¬5-dimethylhydantoin£¬SO2Cl2 6b£¬6 c trichloronitromethane£¬
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2Â¥2012-05-02 17:26:31
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2Â¥: Originally posted by ÒзçÌýÑ© at 2012-05-02 17:26:31:
Áò´¼Óë¶þÁò»¯ÎïÊÇÖØÒªµÄÁ½¸ö biological1 ºÍ
»¯Ñ§ processes.2 ¶þÁò»¯ÎïÖÐÓлú synthesis2 ÊǷdz£ÓÐÓõÄÊÔ¼Á
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