Reversible carbon protonation in the hydrolysis of heterocyclic enol methyl ethers
作者:Brian Capon、Fu-Chiu Kwok
DOI:10.1016/s0040-4020(01)89931-2
日期:1987.1
The kinetics of the hydronium-ion catalysed hydrolysis of the following heterocyclic methyl enol ethers have been measured: 3-methoxybenzofuran, 3-methoxybenzothiophene, 3-methoxy-indole, 3-methoxy-1-methylindole, 3-methoxyfuran, 3-methoxythio-phene, and 2-methoxythiophene. On the basis of the solvent isotope effect = 3.08 and the failure to detect deuterium exchange when the solvent was CD3CD:D2O(9:1
已经测量了以下杂环甲基烯醇醚的水合氢离子催化的水解动力学:3-甲氧基苯并呋喃,3-甲氧基苯并噻吩,3-甲氧基-吲哚,3-甲氧基-1-甲基吲哚,3-甲氧基呋喃,3-甲氧基硫代-酚和2-甲氧基噻吩。根据溶剂同位素效应= 3.08以及当溶剂为CD 3 CD:D 2 O(9:1 v / v)时检测不到氘交换的结论,得出结论,3-水解中的限速步骤甲氧基苯并呋喃是C-质子化。通过比较3-甲氧基-苯并呋喃的水解速率和3-甲氧基茚的水解速率(快2100倍)来测量环氧原子的作用。