Mechanistic Features of the Oxidation–Reductive Coupling of Alcohols Catalyzed by Oxo-Vanadium Complexes
作者:Eric Steffensmeier、Matthew T. Swann、Kenneth M. Nicholas
DOI:10.1021/acs.inorgchem.8b02968
日期:2019.1.7
Ox–RC) produces carbonyl compounds and hydrocarbon dimers. A mechanistic study of this novel reaction is reported herein. Following our initial disclosure, new findings include the following: (1) The [(salimin)VO2]−-catalyzed Ox–RC of Ph2CHOH in the presence of fluorene affords the products of H-atom abstraction and all possible hydrocarbon dimers. (2) Electronic substituenteffects on the relative rates
氧合钒催化的活性醇氧化还原歧化反应(氧化还原偶合,Ox-RC)产生羰基化合物和烃二聚体。本文报道了对该新颖反应的机理研究。根据我们的初步披露,新发现包括以下内容:(1)在芴存在下[[salimin)VO 2 ] -催化的Ph 2 CHOH的Ox–RC提供了H原子抽象和所有可能的烃二聚体的产物。(2)电子取代基对Ox-RC相对于4-X-BnOH反应物和Bu 4 N [(Y-salimin)VO 2 ]催化剂的相对速率的影响(1a–c)揭示了(a)中X-BnOH反应物与自由基σ参数和(Y-salimin)VO的氧化速率(b)的相关性的氧化速率的相关2 -与标准哈米特σ参数。(3)1a–c电化学还原的难易程度为Y = NO 2 > OMe>H。(4)1与醇相互作用的环境1 H NMR研究表明,其弱缔合关系。(5)Ox-RC反应的密度泛函理论计算模型支持乒乓型催化途径,首先是通过(Salimin)VO
Magnetic Exchange in Transition Metal Complexes. III. Vanadyl Complexes with Tridentate Schiff Bases