Synthesis and Characterization of 2,2-Dimethylpent-4-en-1-yl Complexes of Rhodium and Iridium: Reversible Olefin Decomplexation and C–H Bond Activation
作者:Sumeng Liu、Gregory S. Girolami
DOI:10.1021/acs.organomet.0c00798
日期:2021.3.22
reversibly decomplexes in solution so that the two faces of the olefin are exchanged; for Rh(CH2CMe2CH2CH═CH2)(DBCOT) (2), the activation parameters for olefin decomplexation are ΔH‡ = 19 ± 1 kcal·mol–1 and ΔS‡ = 8 ± 4 cal·mol–1 K–1. Spin saturation transfer studies show that the decomplexation preserves the broken symmetry of the DBCOT ligand, which suggests that the olefin decomplexation in 2 most
我们描述四个η合成和表征1,η 2 -化学计量M(CH 2,2-二甲基戊-4-烯-1-基络合物2 CME 2 CH 2 CH = CH 2)(二烯),其中M是Rh或Ir,二烯为二苯并[a,e]环辛酸酯(DBCOT),1,5-环辛二烯(COD)或降冰片二烯(NBD)。所有这些化合物均具有四坐标方平面结构。我们还制备的双核配合物[Ir(CH 2 CME 2 CH 2 CH = CH 2)(DBCOT)] 2(C 14 H ^ 26),其中由于桥接的二烯烃配体的存在,铱中心为五坐标。在所有的五个络合物中,戊烯基配体的C═C键在溶液中可逆地络合,从而使烯烃的两个表面交换。用于铑(CH 2 CME 2 CH 2 CH = CH 2)(DBCOT)(2),用于烯烃解络激活参数Δ ħ ‡ = 19±1千卡·摩尔-1和Δ小号‡ = 8±4卡· mol –1 K –1。自旋饱和转移研究表明,解配合作用保留了