A study of chemical carcinogenesis. 109. Oxidation of polynuclear aromatic hydrocarbons with ceric ammonium sulfate: preparation of quinones and lactones
Preparation of dihydroxy polycyclic aromatic hydrocarbons and activities of two dioxygenases in the phenanthrene degradative pathway
作者:Kaci L. Erwin、William H. Johnson、Andrew J. Meichan、Christian P. Whitman
DOI:10.1016/j.abb.2019.108081
日期:2019.9
Dihydroxy phenanthrene, fluoranthene, and pyrene derivatives are intermediates in the bacterial catabolism of the corresponding parent polycyclicaromatichydrocarbon (PAH). Ring-opening of the dihydroxy species followed by a series of enzyme-catalyzed reactions generates metabolites that funnel into the Krebs Cycle with the eventual production of carbon dioxide and water. One complication in delineating
二羟基菲,荧蒽和pyr衍生物是相应母体多环芳烃(PAH)细菌分解代谢中的中间体。二羟基物质的开环,随后进行一系列的酶催化反应,生成代谢物,这些代谢物进入克雷布斯循环,最终产生二氧化碳和水。描绘这些途径并将其用于有用目的的一个复杂之处在于,最初的酶促加工过程会产生多种具有多种开环可能性和产物的二羟基PAH。作为解决该问题的系统努力的一部分,合成了八种二羟基物质,并将其表征为二甲氧基或二乙酸酯衍生物。在菲的菲降解途径中用两种双加氧酶检查了几种二羟基化合物。Vanbaalenii分枝杆菌PYR-1。PhdF处理了一个3,4-二羟基菲,其k cat / K m为6.0×10 6 M -1 s -1,该值与该途径中PhdF的注释功能一致。PhdI处理的k cat / K m为3.1×10 5 M -1 s -1的1-羟基-2-萘甲酸,也与该途径中的拟议作用一致。这些观察结果为vanbaaleni
Photolytic decomposition of some polycyclic α-diazoketones: generation and reactivity of 1,2-oxocarbenes in benzene with and without tert-butylamine
作者:Peter J. N. Brown、J. I. G. Cadogan、Ian Gosney、Alexander Johnstone、R. Michael Paton、Norman H. Wilson
DOI:10.1039/p29960002303
日期:——
detected and characterised by EPR spectroscopy. A reinvestigation of the photolytic decomposition of the related polycyclic α-diazoketone 5 under the same conditions has established that a more likely structure for the isolated dihydrofuran is 8, and not the reported isomeric dihydrofuran 20, which is formed from 8 by hydrogen migration during isolation by repeated thick-layer chromatography.