Compounds in which 2,6-di(t-butyl)phenol is substituted in the 4 position by an optionally substituted phenyl group having valuable pharmacological activity as anti-inflammatory agents.
A kineticstudy involving 4-hydroxycinnamic acid derivatives (HCAs) was performed in order to clarify the mechanism for free radical-scavenging and vitamin E-regenerating. The second-order rate con...
为了阐明自由基清除和维生素 E 再生的机制,进行了涉及 4-羟基肉桂酸衍生物 (HCA) 的动力学研究。二阶速率控制...
Reaction of superoxo Co(III) complex with stable phenoxy radicals
作者:A. Nishinaga、H. Tomita、T. Matsuura
DOI:10.1016/s0040-4039(00)78701-6
日期:1980.1
A typical superoxocomplex [Co(CN)5O2][Ph3PNPPh3]3 combines with stable phenoxy radicals in CH2Cl2 leading to selective formation of peroxy--quinols except for 2,4,6-tri--butylphenoxy radical, representing radical reactivity of the complex.
The oxygenation of 2,6-di-t-butylphenols with five-co-ordinate cobalt(II) Schiff-base complexes in aprotic solvents, such as CH2Cl2, thf, and dmf (thf = tetrahydrofuran, dmf = dimethylformamide), has been found to result in regioselective formation of peroxyquinolatocobalt(III) complexes. The regioselectivity depends on the nature of the substituent at the 4-position of the phenol used: 4-alkyl-2,6-di-t-butylphenols
understand the dynamics of antioxidant actions of vitaminE (α-, β-, γ-, and δ-tocopherols, TocH) in biological systems, kinetic study of the formation and decay reactions of vitaminEradicals (α-, β-, γ-, and δ-tocopheroxyls, Toc•) has been performed in organic solvents, using stopped-flow spectrophotometry. By mixing α-, β-, γ-, and δ-TocH with aryloxyl radical (ArO•) in ethanol, the peaks of the UV-vis
为了了解维生素 E(α-、β-、γ-和 δ-生育酚,TocH)在生物系统中的抗氧化作用动力学,对维生素 E 自由基(α-、β -、γ- 和 δ-生育酚 (Toc•) 已在有机溶剂中使用停流分光光度法进行了分析。通过将 α-、β-、γ- 和 δ-TocH 与芳氧基 (ArO•) 在乙醇中混合,α-、β-、γ- 和 δ-Toc• 自由基引起的 UV-vis 吸收峰迅速出现在ca。430-340 nm,出现最大值,然后逐渐衰减。α-Toc• 的形成和衰变(即双分子歧化)反应的二级速率常数(kf 和 2k d )是通过将观测曲线与通过相关微分方程数值计算获得的模拟曲线进行比较来确定的。对上述反应。根据结果,确定了α-Toc•自由基的光谱的最大吸收波长(λ max i) 和摩尔消光系数(ei ) (i = 1-4)。已经观察到显着的溶剂效应对于 α-Toc• 自由基的反应速率(kf 和 2k d