The imidazole catalyzed hydrolysis of polar substituted 2,4-dinitrophenyl acetates in water has been investigated at different temperatures. The observed rates correspond to the bimolecular nucleophilic addition of the imidazole at the carboxylic carbon atom followed by a very fast hydrolysis of the N-acetylimidazole in water. The influence of polar substituents in the acid moiety of the ester molecule on the hydrolysis reaction can be described by an electrostatic dipole–dipole interaction in the same way as the neutral hydrolysis of polar substituted ethyl acetates.
咪唑催化
水解极性取代的
2,4-二硝基苯乙酸酯的反应在不同温度下已被研究。观察到的速率与
咪唑在羧基碳原子上的双分子亲核加成相一致,随后在
水中快速
水解N-乙酰
咪唑。酯分子酸部分中极性取代基对
水解反应的影响可以通过电荷间的偶极-偶极相互作用来描述,正如极性取代
乙酸乙酯的中性
水解一样。