Sur les quinones dérivées du diphényle formées par oxydation d'éthers de benzohydroquinones substiuées
作者:Th. Posternak、W. Alcalay、R. Luzzati、A. Tardent
DOI:10.1002/hlca.19480310232
日期:——
Les quinones obtenues paroxydation d'éthers de benzhydroquinones substituées dérivent de la diphénoquinone-3,6 et noncomme on I'avait indiqué autrefois, de la diphénoquinone-6,6′.
Preparation of a series of substituted diquinones is reported. In most examples, inverse order of addition (addition of a dimethoxybenzene derivative to a CAN solution) has been found to produce higher yields of diquinones than the traditional protocol in which the oxidant is added to the arene.
Rechargeablebatteries using organiccathodematerials are expected to afford high mass energy densities since these materials can undergo multiple electron redox reactions per molecule. Although the batteries using benzoquinone (BQ) derivatives as organiccathode active materials exhibited high theoretical capacity, their practical capacities and cycle retention were far from satisfactory. To overcome
使用有机阴极材料的可充电电池有望提供高质量的能量密度,因为这些材料每个分子可以经历多次电子氧化还原反应。尽管使用苯醌(BQ)衍生物作为有机阴极活性材料的电池具有较高的理论容量,但其实际容量和循环保持率仍远远不能令人满意。为克服这些问题,合成了基于2,2'-双-对-苯醌(BBQ)骨架的二聚BQ衍生物,并研究了使用BBQs作为正极活性物质制备的电池的充放电行为。与基于BQ单体的电池相比,基于BBQ的电池表现出出色的性能。例如,烧烤室提供了358 A h kg -1的高初始容量(比使用LiCoO 2作为正极活性材料的现有锂离子电池的两倍多)和在50次循环下的198 A h kg -1的高循环保持率。电化学测量和密度泛函理论(DFT)计算表明,烧烤衍生物中通常会发生三个电子氧化还原反应,尽管(OMe)2 -BBQ似乎经历了四电子氧化还原反应。
Electronic effects in the oxidation of 1,4-Dimethoxybenzene derivatives with ceric ammonium nitrate
作者:Brian E. Love、Alexander L. Simmons
DOI:10.1080/00397911.2022.2095209
日期:2022.8.3
electronic nature of substituents present in 1,4-dimethoxybenzene derivatives has been found to have a profound effect on whether or not such substrates can be oxidized to diquinones using cericammoniumnitrate (CAN). In particular, there appears to be a correlation between the Hammett σp value of a substituent and the yield of the corresponding diquinone obtained upon treatment of the dimethoxybenzene
摘要 已经发现存在于 1,4-二甲氧基苯衍生物中的取代基的电子性质对这些底物是否可以使用硝酸铈铵 (CAN) 氧化成二醌具有深远的影响。特别是,在取代基的 Hammett σ p值与用 CAN 处理二甲氧基苯衍生物时获得的相应二醌的产率之间似乎存在相关性。该信息可以帮助预测给定的底物是否会在这种氧化时产生二醌。