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and/or selectivity improvements are also observed, they are regarded
as environmentally friendly green solvents.7 In this context,
the use of [bmim][BF4] as a solvent for the oxidation of thiols in the
presence of a base was described.8 Recently, we have reported the
use of the new cationic selenium-based acidic ionic liquid phenyl
butyl ethyl selenonium tetrafluoroborate, [pbeSe][BF4], as an efficient
catalyst in several acid-catalyzed reactions.9 Besides, the
application of the ionic liquid containing anionic selenium-based
[bmim][SeO2(OCH3)] in the oxidative carbonylation of aniline
was also described.10 The selenium-containing ionic-liquids shown
superior catalytic performance and were reused without losing
their initial activity.10 Due to our interest in new applications for
selenium-based ionic liquids,9 we decide to study the use of
[bmim][SeO2(OCH3)]10 as the solvent in the oxidation of thiols to
symmetrical disulfides (Scheme 1).
Initially, we chose benzenethiol as a substrate to establish the
best condition for the air oxidation reaction in the presence of
1.0 mL of [bmim][SeO2(OCH3)]. Thus, a mixture of benzenethiol
(1.0 mmol) and [bmim][SeO2(OCH3)] was stirred for 12 h at room
temperature furnishing diphenyl disulfide 1a in 45% yield. This
unexpected, new result showing the ionic liquid acting both, as a
solvent and catalyst, encouraged us to investigative the effect of
the temperature in this base-free oxidation. To our satisfaction,
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至尊木虫 (职业作家)

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爱与雨下: 金币+1 2012-05-02 19:07:34
爱与雨下: , 欢迎常来~! 2012-05-02 19:07:46
转弯为你相遇: 金币+35, 翻译EPI+1, ★★★很有帮助 2012-05-03 18:36:43
sltmac: 金币+5 2012-05-21 09:20:49
我们也发现了选择性改善,它们被认为是环境友好的绿色溶剂。本文中阐述了在碱的作用下以 [bmim][BF4]为溶剂氧化硫代化合物 的反应8。最近我们报导了在酸催化反应中硒离子的使用以及苯基、丁基、乙基、 [pbeSe][BF4]作为有效催化剂9 。此外,我们还阐述了在[bmim][SeO2(OCH3)]催化下硒离子溶液的应用,以此进行苯胺的氧化酰化反应10 。其中包含硒离子的离子溶液催化效率显著,再利用率高10 。由此我们对硒离子的新应用产生了兴趣, 我们决定研究[bmim][SeO2(OCH3)]作为溶剂氧化硫代化合物成二硫化合物的反应。开始的时候,我们选择苯硫酚作为底物选择过氧化反应的最优化条件,即1.0 mL 的 [bmim][SeO2(OCH3)] 。然后,将(1.0 mmol) 和 [bmim][SeO2(OCH3)] 在室温下搅拌12小时,从而得到了二苯基二硫代化合物产率为45%。使我们惊喜的是,当离子溶液既作为溶剂又作为催化剂时会提高无碱氧化速率。让我们满意的是:
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2楼2012-05-02 18:19:38
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