A bromo-capped diruthenium(<scp>i</scp>,<scp>i</scp>) N-heterocyclic carbene compound for <i>in situ</i> bromine generation with NBS: catalytic olefin aziridination reactions
作者:Gargi Sengupta、Pragati Pandey、Subhabrata De、Ramesh Ramapanicker、Jitendra K. Bera
DOI:10.1039/c8dt01851k
日期:——
at room temperature. Cycloalkene and stilbene are readily brominated by stoichiometric reactions with 1 and NBS. An analysis of the dibrominated products suggests the formation of cyclic bromonium intermediates indicating in situ Br2 generation. Complex 2, an iodide analogue of 1, is also synthesized. The reaction of 2 with N-iodosuccinimide releases I2, which is confirmed by the starch-iodine test
溴封端的金属-金属键合钌(I,I)络合物Ru 2(CO)4(PIN)2 Br 2(1)(PIN = 1-异丙基-3-(5,7-二甲基-1,8-萘啶-2-基)咪唑-2-亚胺在室温下与N-溴代琥珀酰亚胺(NBS)生成溴。环烯烃和二苯乙烯容易通过与1和NBS的化学计量反应进行溴化。对二溴化产物的分析表明,环状溴中间体的形成表明原位Br 2的产生。络合物2,碘化物类似物1,也是合成的。2与N-碘代琥珀酰亚胺的反应释放出I 2,该反应通过淀粉-碘测试得到证实。对苯酚的溴化反应,研究了1的催化作用。催化剂1与NBS和碱混合,对单溴化产物具有区域选择性。此外,在NBS,K 2 CO 3和TsNH 2的存在下利用催化剂1证明了有效的烯烃叠氮化。