that using 1 as catalyst precursor above 328 K decreases the activity through a thermally competitive mechanistic pathway. Indeed, the reduction of the ancillary trifluoroacetate ligand to give the corresponding silylether CF3CH2OSiR3 has been observed. Moreover, mechanistic studies for the 1‐catalyzed CO2‐hydrosilylation reaction based on experimental and theoretical studies suggest that 1 prefers an
CO的氢化
硅烷化2具有不同
硅烷如HSiEt 3,HSiMe 2 PH,HSiMePh 2,HSiMe(OSiMe 3)2,和在HSi(OSiMe 3)3中的
铱的催化ammounts的存在(III)配合物[Ir( H)(CF 3 CO 2)(NSiN *)(coe)](1 ; NSiN * = fac-双-(4-
甲基吡啶-2-基氧基); coe =顺式-环
辛烯)。基于1的氢化
硅烷化催化体系的活性取决于还原剂的性质,其中HSiMe(OSiMe 3)2被证明是最活跃的。发现前述反应对形成相应甲
硅烷基
甲酸酯具有高度选择性。已经发现在328K以上使用1作为催化剂前体通过热竞争机制途径降低了活性。实际上,已经观察到辅助
三氟乙酸酯
配体的还原以得到相应的甲
硅烷基醚CF 3 CH 2 OSiR 3。此外,基于实验和理论研究的1催化CO 2加氢
硅烷化反应的机理研究表明,1偏爱CO 2的内层机理还原,而密切相关的[Ir(H)(CF