Mechanistic Insights on the Functionalization of CO
<sub>2</sub>
with Amines and Hydrosilanes Catalyzed by a Zwitterionic Iridium Carboxylate‐Functionalized Bis‐NHC Catalyst
作者:Ana I. Ojeda‐Amador、Julen Munarriz、Pablo Alamán‐Valtierra、Víctor Polo、Raquel Puerta‐Oteo、M. Victoria Jiménez、Francisco J. Fernández‐Alvarez、Jesús J. Pérez‐Torrente
DOI:10.1002/cctc.201901687
日期:2019.11.21
pressure (3 bar) the formamide derivative was obtained as major reaction product. The unexpected formation of pyrrolidin‐1‐ium formate as intermediate of the reaction the 1‐catalyzed of CO2 with pyrrolidine and HSiMe2Ph has been observed, and its role in the formation of 1‐formylpyrrolidine rationalized. Moreover, a mechanism for the reaction of CO2 with hydrosilanes, in the presence and in the absence
两性离子络合物[Cp * IrCl (MeIm)2 CHCOO}](1)有效催化CO 2的选择性氢化硅烷化,得到相应的甲硅烷基甲酸酯。使用HSiMe 2 Ph在348 K的乙腈中已获得最佳反应性能。吡咯烷与CO 2和HSiMe 2 Ph的1催化反应在很大程度上取决于CO 2压力。在低浓度的CO 2(1 bar)下,通过插入CO 2形成相应的甲硅烷基氨基甲酸酯观察到原位生成的甲硅烷基胺的Si-N键进入了N-键,而在较高压力(3巴)下获得了作为主要反应产物的甲酰胺衍生物。观察到意外地形成了吡咯烷-1-甲酸甲酸,作为CO 2与吡咯烷和HSiMe 2 Ph的1催化反应的中间体,并且其在1-甲酰基吡咯烷的形成中的作用是合理的。此外,基于理论计算,已经提出了在有或没有胺的情况下CO 2与氢硅烷反应的机理。