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at a gentle heating (60 C), the reaction proceeded slowly furnishing the desired diphenyl disulfide 1a in 98% isolated yield after 12 h. In order to obtain an efficient protocol in terms of energy economy, we make a study to establish the minimum time associated with a good reaction rate under the optimized conditions, and the results are summarized in Figure 1. Analyzing the Figure 1, total conversion of benzenethiol was observed after 3 h of reaction. A further decreasing of the reaction time was followed by a considerable reduction in the conversion rate of benzenethiol. Under the optimized conditions (method A),11 a variety of organothiols were oxidized smoothly to produce disulfides 1a–r in |
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