Silylpalladium Cations Enable the Oxidative Addition of C(sp<sup>3</sup>)–O Bonds
作者:Andreas L. Wierschen、Neyen Romano、Stephen J. Lee、Michel R. Gagné
DOI:10.1021/jacs.9b08178
日期:2019.10.9
characterization of the room temperature and solution stable silylpalladium cations [(PCy3)2PdSiR3+(C6F5)4B- (SiR3 = SiMe2Et, SiEt2H)] and [(Xantphos)PdSiR3+(BArf4) (SiR3 = SiMe2Et, SiEt2H; Xantphos = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene; BArf4 = (3,5-(CF3)2C6H3)4B-)] are reported. Spectroscopic and ligand addition experiments suggest that silylpalladium complexes of the type (PCy3)2PdSiR3+ are 3-coordinate
室温和溶液稳定的甲硅烷基钯阳离子[(PCy3)2PdSiR3+(C6F5)4B-(SiR3 = SiMe2Et, SiEt2H)]和[(Xantphos)PdSiR3+(BArf4)(SiR3 = SiMe2Et, SiEt2H)的合成和表征; ,5-双(二苯基膦)-9,9-二甲基呫吨;BArf4 = (3,5-(CF3)2C6H3)4B-)]。光谱和配体添加实验表明 (PCy3)2PdSiR3+ 类型的甲硅烷基钯配合物是 3 坐标和 T 形。将二烷基醚添加到基于 PCy3 和 Xantphos 的甲硅烷基钯阳离子导致 C(sp3)-O 键断裂并生成阳离子 Pd-烷基配合物。从机械上讲,甲硅烷基钯阳离子能够同时充当亲电甲硅烷离子和亲核 LnPd(0) 的来源。