Cobalt Catalyst‐Controlled Selective Dioxygenation of Styrenes Using
<i>N‐</i>
Hydroxyphthalimide with Molecular Oxygen
作者:Xiaosong Hao、Huihui Ji、Hongju Zhan、Qian Zhang、Dong Li
DOI:10.1002/adsc.202100921
日期:2022.1.4
A cobalt-catalyzed selective dioxygenation of styrenes with N-hydroxyphthalimide (NHPI) was developed using molecular oxygen as the terminal oxidant. Alcohol and ketone products can be selectively formed from identical substrates by catalyst control. The reaction was applicable to a broad range of styrenes and exhibited good functional group tolerance. It provided a method for preparation of 1,2-diol
Alkane Oxidation with Molecular Oxygen Using a New Efficient Catalytic System: <i>N</i>-Hydroxyphthalimide (NHPI) Combined with Co(acac)<i><sub>n</sub></i> (<i>n</i> = 2 or 3)
A novel class of catalysts for alkane oxidation with molecularoxygen was examined. N-Hydroxyphthalimide (NHPI) combined with Co(acac)(n)() (n = 2 or 3) was found to be an efficient catalytic system for the aerobic oxidation of cycloalkanes and alkylbenzenes under mild conditions. Cycloalkanes were successfully oxidized with molecularoxygen in the presence of a catalytic amount of NHPI and Co(acac)(2)
The catalytic epoxidation of alkenes by molecular oxygen activated in the systemcontainingN-hydroxyphthalimide (NHPI) and active alkenes such as styrene, 2-norbornene or indene is reported. The transient intermediates, alkyl hydroperoxides formed by autoxidation of NHPI and the active alkenes are proposed as oxygen sources which transfer mono-oxygen to MnIIITPPCl.
据报道,烯烃在含N-羟基邻苯二甲酰亚胺(NHPI)和活性烯烃(如苯乙烯,2-降冰片烯或茚)的体系中被分子氧活化而催化环氧化。提出了过渡中间体,通过NHPI的自氧化形成的烷基氢过氧化物和活性烯烃作为将单氧转移到Mn III TPPCl的氧源。
Novel Catalysis by N-Hydroxyphthalimide in the Oxidation of Organic Substrates by Molecular Oxygen