Transition metal complexes of a bis(carbene) ligand featuring 1,2,4-triazolin-5-ylidene donors: structural diversity and catalytic applications
作者:Vivek Kumar Singh、S. N. R. Donthireddy、Praseetha Mathoor Illam、Arnab Rit
DOI:10.1039/d0dt02142c
日期:——
[Ir(Cp*)Cl2]2 to generate a doubly C–H activated IrIII–NHC complex 5. Similarly, the triazolinylidene donor supported diorthometalated RuII-complex 6 is also obtained. Complexes 5 and 6 represent the first examples of a stable diorthometalated binuclear IrIII/RuII-complex supported by 1,2,4-triazolin-5-ylidene donors. The synthesized IrIII–NHC complex 5 is found to be more effective than its RuII-analogue
1,3-双(1,2,4-三唑-1-基)苯与溴乙烷的二烷基化反应会导致形成[ L -H 2 ] Br 2,在与NH 4 PF 6进行盐复分解反应后,产生带有非配位抗衡离子的双(三唑鎓)盐[ L -H 2 ](PF 6)2。[ L -H 2 ](PF 6)2和Ag 2 O以1:1的比例反应,生成组成为[(L)2 Ag 2 ](PF 6)的双核Ag I-四碳烯络合物)2与[Cu(SMe 2)Br]进行容易的金属转移反应,生成相应的Cu I -NHC络合物[(L)2 Cu 2 ](PF 6)2。相比之下,[ L -H 2 ] Br 2与[Ir(Cp *)Cl 2 ] 2反应生成双重CH-活化的Ir III -NHC络合物5。类似地,供体triazolinylidene支持的diorthometalated钌II -配合物6也被获得。配合物5和6代表由1,2,4-三唑啉-5-亚烷基供体支撑的稳定的双原金属化双核Ir