Amidomagnesium cations

摘要

We report the synthesis, structure and reactivity of molecular amidomagnesium cations bearing tris{2-(dimethylamino)-ethyl}amine (Me6TREN). Me6TREN binds to the cationic magnesium centre exhibiting (4) and (3) coordination modes in [Me6TREN-Mg-N(SiHMe2)(2)](+) and [Me6TREN-Mg-N(SiMe3)(2)](+) respectively. [Me6TREN-Mg-N(SiHMe2)(2)](+) reacts with benzophenone resulting in the insertion of the carbonyl group across -SiH bond. The reaction between [Me6TREN-Mg-N(SiMe3)(2)](+) and CO2 leads to [Me6TREN-Mg-OSiMe3](+), while the reaction with H2O results in [Me6TREN-Mg-OH](2)(2+). Attempts to prepare hydridomagnesium cations from [Me6TREN-Mg-N(SiMe3)(2)](+) using KH resulted in the precipitation of MgH2 and the isolation of [(Me6TREN)K(THF)(3)](+).