Structure and Solution Equilibrium of N-Salicylidene-amino-sugars and Amino-alcohols.
作者:Shigeharu Inouye
DOI:10.1248/cpb.15.1540
日期:——
The structures and solution equilibria of twenty members of N-salicylidene-amino-sugars and -amino-alcohols were examined mainly in methanol, water and solid state. As the modeled compounds were examined simultaneously three members of N-salicylidene-alkylamines and eight members belonged to the o-methoxybenzylidene, 3-methoxysalicylidene, 3, 5-dibromosalicylidene and 2-hydroxynaphthylidene derivatives. From the comparative studies on the electronic, infrared, NMR spectra and equilibrium position, it was shown that the solution equilibrium consisted of the phenolimine and the ketoamine species, the latter being stabilized by the intra- and intermolecular hydrogen bonding involving the alcoholic hydroxyl groups and protic solvents. The acid-base equilibria of the two tautomers in methanol and the ketoamine-ion-pair equilibrium in water were discussed.
二十种N-水杨醛基氨基糖和氨基醇的结构及溶液平衡主要在甲醇、水和固态下进行了研究。由于所建模的化合物是同时考察的,因此其中包括三种N-水杨醛基烷基胺和八种属于o-甲氧基苯亚甲基、3-甲氧基水杨醛基、3,5-二溴水杨醛基和2-羟基萘亚甲基衍生物。从电子、红外、核磁共振谱及平衡位置的比较研究中显示,溶液平衡由酚亚胺和酮胺物种组成,后者通过涉及醇羟基和质子溶剂的分子内和分子间氢键得以稳定。讨论了甲醇中两个互变异构体的酸碱平衡以及水中酮胺离子对的平衡。