Selective oxidation of primary alcohols mediated by nitroxyl radical in aqueous solution. Kinetics and mechanism
作者:Arjan E.J. de Nooy、Arie C. Besemer、Herman van Bekkum
DOI:10.1016/0040-4020(95)00417-7
日期:1995.7
The kinetics of the TEMPO-mediated oxidation of methyl α-d-glucopyranoside to sodium methyl α-d-glucopyranosiduronate were studied. An intermediate was found which was identified as the hydrated aldehyde. This was oxidised in the same manner as the alcohol, with pseudo first order rate constants ratio kobs,ald/kobs,alc — 7. The reaction mechanism is discussed with emphasis on steric factors and compared
研究了TEMPO介导的α-d-吡喃葡萄糖苷甲基氧化成α-d-吡喃葡萄糖苷神经酸钠的动力学。发现了一种中间体,该中间体被鉴定为水合醛。以与醇相同的方式将其氧化,具有伪一级速率常数比率k obs,ald / k obs,alc -7。讨论了反应机理,着重于空间因素,并与文献数据进行了比较。假定了两种不同的反应途径。在碱性反应条件下通过环状过渡态3,在酸性反应条件下通过非环状过渡态4。