Stereoselective oxidation of alkanes with m-CPBA as an oxidant and cobalt complex with isoindole-based ligands as catalysts
作者:Oksana V. Nesterova、Maximilian N. Kopylovich、Dmytro S. Nesterov
DOI:10.1039/c6ra14382b
日期:——
substrates (>98% for cis-1,2-DMCH) and highest cis/trans ratio of tertiary alcohols (products) of 56, under mild conditions. The best achieved yields of tertiary cis-alcohols were of 13.7 and 50.5%, based on the substrate (cis-1,2-DMCH) and the oxidant (m-CPBA) respectively. Kinetic experiments, high bond and stereoselectivity parameters, kinetic isotope effect of 7.2(2) in the oxidation of cyclohexane, and
具有通式[M C 6 H 4 C(NH 2)NC(ONCMe 2)2 } 2 ](NO 3)2的异吲哚核配体的两个配合物(M = Co表示1,M = Ni表示2)研究作为催化剂用于与轻度立体选择性氧化烷烃米氯过苯甲酸(米-CPBA)作为氧化剂和顺-1,2-二甲基环己烷(顺式-1,2- DMCH)作为主要模型底物。配合物1表现出显着的活性,并高度保留了底物的立体构型(顺式> 98%-1,2- DMCH)和最高的顺/反式的56(产品),在温和条件下的叔醇的比率。基于底物(顺式-1,2-DMCH)和氧化剂(m -CPBA),最佳的顺式叔醇收率分别为13.7和50.5%。动力学实验,高粘合和立体选择性的参数,在将环己烷氧化的7.2(2)动力学同位素效应,和掺入18从H 2 O 2 18 O支持Co的参与IV ø高价金属-氧中间体作为主要的C -H攻击物种。