Elemental Sulfur Disproportionation in the Redox Condensation Reaction between<i>o</i>-Halonitrobenzenes and Benzylamines
作者:Thanh Binh Nguyen、Ludmila Ermolenko、Pascal Retailleau、Ali Al-Mourabit
DOI:10.1002/anie.201408397
日期:2014.12.8
The disproportionation of elemental sulfur at moderate temperatures is investigated in the redox condensation involving o‐halonitrobenzenes 1 and benzylamines 2. As a redox moderator, elemental sulfur plays the dual role of both electron donor and acceptor, generating its lowest and highest oxidation states: S−2 (sulfide equivalent) in benzothiazole 3 and S+6 (sulfate equivalent) in sulfamate 4, and
在涉及邻卤代硝基苯1和苄胺2的氧化还原缩合反应中,研究了元素硫在中等温度下的歧化作用。作为氧化还原缓和剂,元素硫同时发挥电子给体和受体的双重作用,产生最低和最高的氧化态:苯并噻唑3中的S -2(硫化物当量)和氨基磺酸盐4中的S +6(硫酸当量),并填充整体氧化还原凝聚过程的电子间隙。伴随着这个过程,一系列的反应还原了1的硝基,还原了2的氨甲基,无金属的芳族卤素取代和缩合最终形成了2-芳基苯并噻唑3。