Dirhodium-Catalyzed Phenol and Aniline Oxidations with T-HYDRO. Substrate Scope and Mechanism of Oxidation
作者:Maxim O. Ratnikov、Linda E. Farkas、Emily C. McLaughlin、Grace Chiou、Hojae Choi、Sahar H. El-Khalafy、Michael P. Doyle
DOI:10.1021/jo1024865
日期:2011.4.15
and CuI are provided, and mechanistic comparisons are made between these catalysts that are based on diastereoselectivity (reactions with estrone), regioselectivity (reactions with p-tert-butylphenol), and chemoselectivity in the formation of 4-(tert-butyldioxy)cyclohexadienones. The data obtained are consistent with hydrogen atom abstraction by the tert-butylperoxy radical followed by radical combination
A recyclable polymer-supported ruthenium catalyst for the oxidative degradation of bisphenol A in water using hydrogen peroxide
作者:Zongmin Hu、Chi-Fai Leung、Yat-Kwai Tsang、Hongxia Du、Haojun Liang、Yongfu Qiu、Tai-Chu Lau
DOI:10.1039/c0nj00583e
日期:——
A polypyridyl ruthenium(II) complex, cis-[RuII(2,9-Me2phen)2(H2O)2]2+, has been adsorbed onto the cation-exchange resins Dowex-50W and Chelex-100. The potential use of the supported ruthenium(II) complex as catalyst for the oxidative degradation of organic pollutants in water has been investigated using bisphenol A, an emerging endocrine disruptor, as substrate; and the environmentally friendly H2O2
聚吡啶钌(II)络合物,顺-[Ru II(2,9-Me 2 phen)2(H 2 O)2 ] 2+吸附在阳离子交换树脂Dowex-50W和Chelex-100上。负载型钌(II)配合物作为催化氧化降解有机污染物的潜在用途。水 已经使用 双酚A,一种新兴的内分泌干扰物,作为底物;以及作为氧化剂的环保型H 2 O 2。发现这些固体负载的催化剂对于降解三聚氰胺是有效的。双酚A在环境条件下用H 2 O 2在水溶液中溶解。中间体的氧化降解过程中形成的中间体和产物双酚A已经确定了通过这些催化体系的机理,并提出了一种机理。负载的催化剂可通过简单的过滤轻松回收,并且在循环使用时不会显示出活性损失。
Structural Identification and Kinetic Analysis of the <i>in Vitro</i> Products Formed by Reaction of Bisphenol A-3,4-quinone with <i>N</i>-Acetylcysteine and Glutathione
作者:Douglas E. Stack、John A. Conrad、Bejan Mahmud
DOI:10.1021/acs.chemrestox.7b00239
日期:2018.2.19
DNA and other endogenous nucleophiles. We have structurally identified the products resulting from the reaction of bisphenol A-3,4-quinone (BPAQ) with N-acetylcysteine (NAC) and glutathione (GSH). The major and minor isomers are both the result of 1,6-conjugate addition and are produced almost instantly in high yield. Reactions using 1.3 equiv of GSH showed the presence of a bis-glutathionyl adduct which
双酚A(BPA)作为破坏内分泌的化学物质和可能的遗传毒性代谢物而受到了广泛关注。BPA代谢导致形成电的ö -quinones结合DNA和其它内源性亲核试剂电缆。我们已经从结构上确定了双酚A-3,4-醌(BPAQ)与N-乙酰半胱氨酸(NAC)和谷胱甘肽(GSH)反应生成的产物。主要和次要异构体都是1,6-共轭物加成的结果,几乎可以立即以高收率生产。使用1.3当量的GSH的反应表明存在双谷胱甘肽加合物,相对于BPAQ,使用较高的GSH浓度未观察到。NAC与BPAQ的反应显示没有bis- N-乙酰半胱氨酸加合物。停止流动动力学分析表明,对于NAC和GSH反应,添加的1,6-共轭物是可逆的,激活的正向自由能分别为9.2和7.8 kcal / mol。与NAC相比,GSH的双分子正向速率常数恒定在19.4°C约快三倍,分别为1547和496 M –1 s –1。逆反应的活化自由能相近,NAC和GSH分别为11
Bisphenol A was oxidized to monoquinone and bisquinone derivatives by Fremy's salt, a radical oxidant, though salcomine and alkali did not catalyze the oxidation by molecular oxygen. Bisphenol A, bisphenol B, and 3,4'-(1-methylethylidene)bisphenol were converted to their monoquinone derivatives in the presence of tyrosinase at 25 degrees C at pH 6.5, but not to the bisquinone derivatives under these
Oxygenation of Bisphenol A to Quinones by Polyphenol Oxidase in Vegetables
作者:Mitsuru Yoshida、Hiroshi Ono、Yoshiko Mori、Yoshihiro Chuda、Motoyuki Mori
DOI:10.1021/jf020206e
日期:2002.7.1
understand conversion of bisphenol A and its related compounds under some chemical and biological environments, oxidation of these compounds was performed. Bisphenol A was oxidized to monoquinone and bisquinone derivatives by Fremy's salt, a radical oxidant; but salcomine and alkali did not catalyze the oxidation by molecular oxygen. Bisphenol A, bisphenol B, and 3,4'-(1-methylethylidene)bisphenol were converted