Switching the Electron-Donating Ability of Phosphines through Proton-Responsive Imidazolin-2-ylidenamino Substituents
作者:Paul Mehlmann、Fabian Dielmann
DOI:10.1002/chem.201805540
日期:2019.2.11
Stimuli‐responsive ancillary ligands are valuable tools to control the activity and selectivity of transition‐metal catalysts. The synthesis and characterization of a series of metalcomplexescontaining phosphines with proton‐responsive imidazolin‐2‐ylidenamino substituents are reported. Determination of the ligand‐donorproperties revealed that protonation of each substituent increases the Tolman
刺激响应的辅助配体是控制过渡金属催化剂活性和选择性的有价值的工具。报道了一系列含膦的质子反应性咪唑啉-2-亚胺基氨基取代基的金属配合物的合成和表征。配体-给体性质的确定表明,每个取代基的质子化使膦的托尔曼电子参数(TEP)增加22 cm -1,因此可以在前所未有的范围内切换膦2的电子给体功率(ΔTEP= 43.4 cm -1)。