Mechanism of the Hydrogen Chloride/Methanol-Catalyzed Mutarotation Reaction of N-(p-Chlorophenyl)-β-D-glucopyranosylamine
作者:Kazimiera Smiataczowa、Katarzyna Maj、Piotr Skurski
DOI:10.1002/1099-0690(200111)2001:22<4269::aid-ejoc4269>3.0.co;2-g
日期:2001.11
The rate of the hydrogen chloride/methanol-catalyzed mutarotation of N-(p-chlorophenyl)-β-D-glucopyranosylamine has been studied polarimetrically at 16, 20, 25, and 30 °C. Rate constants and activation parameters have been determined for two parallel reactions. Enthalpies of formation, ΔHfo, and entropies, S°, have been determined using the PM3 method for the various structures involved in the anomerization
已在 16、20、25 和 30 °C 下通过极化研究了氯化氢/甲醇催化的 N-(对氯苯基)-β-D-吡喃葡萄糖胺变旋化的速率。已经确定了两个平行反应的速率常数和活化参数。对于异构化中涉及的各种结构,已经使用 PM3 方法确定了生成焓 ΔHfo 和熵 S°。还计算了对氯苯胺 ND-葡萄糖苷分子周围的静电势。讨论了实验和计算激活参数之间的差异。发现相对稳定的无环亚胺离子是反应的中间体。