Electrochemical Hydroxylation of Arenes Catalyzed by a Keggin Polyoxometalate with a Cobalt(IV) Heteroatom
作者:Alexander M. Khenkin、Miriam Somekh、Raanan Carmieli、Ronny Neumann
DOI:10.1002/anie.201801372
日期:2018.5.4
a catalyst and lithium formate as an electrolyte via formation of a formyloxyl radical as the reactive species, which was trapped by a BMPO spin trap and identified by EPR. Hydrogen was formed at the Pt cathode. The sum transformation is ArH+H2O→ArOH+H2. Non‐optimized reaction conditions showed a Faradaic efficiency of 75 % and selective formation of the mono‐oxidized product in a 35 % yield. Decomposition
芳烃(例如苯到苯酚)的可持续,选择性直接羟基化是一项重要的研究挑战。提出了使用甲酸氧化苯及其卤代衍生物以选择性地产生芳基甲酸酯的电催化转化,其易于被水水解以产生相应的苯酚。甲酰化反应在[Co III W 12 O 40 ] 5−作为催化剂和甲酸锂作为电解质的情况下,通过形成甲酰氧基作为反应性物质在Pt阳极上发生,该自由基被BMPO自旋阱捕获并由EPR确定。在Pt阴极上形成氢。总和为ArH + H 2 O→ArOH + H 2。未优化的反应条件显示出75%的法拉第效率和35%的收率选择性形成了单氧化产物。甲酸分解为CO 2和H 2是一种副反应。