Activation and Oxidation of Mesitylene C–H Bonds by (Phebox)Iridium(III) Complexes
作者:Meng Zhou、Samantha I. Johnson、Yang Gao、Thomas J. Emge、Robert J. Nielsen、William A. Goddard、Alan S. Goldman
DOI:10.1021/acs.organomet.5b00200
日期:2015.6.22
ligand exchange of complex 3. Both complexes 1 and 2 catalyze H/D exchange between mesitylene and D2O at 180 °C, exclusively at the benzylic position; 2 gave a higher turnover number (11 TO) than 1 (6 TO) in 12 h. Using d4-acetic acid as the source of deuterium, up to 92 turnovers of benzylic H/D exchange of mesitylene were obtained with complex 1. (Phebox)Ir(OCOCF3)2OH2 catalyzed the benzylic C–H oxidation
钳形铱(III)络合物(Phebox)Ir(OAc)2 OH 2(1)(Phebox = 3,5-二甲基苯基-2,6-双(恶唑啉基)),选择性地裂解均三甲苯的苄基C–H键形成> 90%收率的可分离的铱金属间化合物(Phebox)Ir(金属间)(OAc)(3)。合成了三氟乙酸盐类似物(Phebox)Ir(OCOCF 3)2 OH 2(2),以与配合物1进行C–H活化比较,并合成了(Phebox)Ir(甲磺酰基)(OCOCF 3)(4)。配位体的交换3。1号和2号复合体仅在苄基位置上,在180°C下催化1,3,5-三甲基苯与D 2 O之间的H / D交换;2在12小时内的周转率(11 TO)比1(6 TO)高。使用d 4-乙酸作为氘的来源,与配合物1可获得高达92次的均三甲苯间苄基H / D交换。(Phebox)Ir(OCOCF 3)2 OH 2使用Ag 2催化均三甲苯的苄基CH氧化O在130