Oxidation of threose-series pentoses and hexoses by sodium N-chloro-p-toluenesulfonamide
作者:Kanchugarakoppal S. Rangappa、Huchappa Manjunathaswamy、Manikanahally P. Raghavendra、D.Channe Gowda
DOI:10.1016/s0008-6215(98)00046-9
日期:1998.2
kinetics and mechanism of oxidation of threose-series hexoses and pentoses by chloramine-T in alkaline medium was investigated. Kinetic studies with d -galactose, d -sorbose, d -xylose, and d -lyxose showed that the rate of the reaction was first order with respect to sugar and chloramine-T, and second order with respect to hydroxide ion. p-Toluenesulfonamide and chloride ions, the reduced products of
摘要研究了氯胺-T在碱性介质中氧化苏糖系列己糖和戊糖的动力学及其机理。用d-半乳糖,d-山梨糖,d-木糖和d-lyxose进行的动力学研究表明,反应速率相对于糖和氯胺-T为一级,而对于氢氧根离子为二级。对甲苯磺酰胺和氯离子是氯胺-T的还原产物,对反应速率没有影响。该速率随着介质的离子强度的增加而增加,并且介电效应为负。H2O-D2O混合物中的质子清单研究表明存在一个过渡态。d-古洛糖,d-idose,l-山梨糖,d-半乳糖,d-talose,d-塔格糖,d-木糖的产品分析 d-lyxose和d-lyxose揭示了所有lyxose系列己糖主要产生了lyxonic和苏糖酸的混合物,以及少量的己酸,xylonic和甘油酸,而所有木糖系列hexoses产生了lyxonic,threonic和甘油酸以及少量的xylonic混合物。和己酸。木糖和lyxose得到的混合物主要由lyxonic酸,thre