2-Amino-4-methylthiazol-3-oxide 5 is reacted with isocyanates and with acid chlorides. Aliphatic isocyanates attack the 5-position aromatic isocyanates, however, attack the N-oxide-oxygen of the heterocyclic ring. Acid chlorides react with 5 giving reactive N-acylammonium salts which can be isomerisized by bases. As with isocyanates differences of the individual acid chlorides can be observed: with
使
2-氨基-4-甲基噻唑-3-氧化物5与
异氰酸酯和酰
氯反应。脂族
异氰酸酯侵蚀5-位芳族
异氰酸酯,然而,侵蚀杂环的N-氧化物-氧。酰
氯与5反应生成反应性N-酰基
铵盐,该盐可被碱异构化。与
异氰酸酯一样,可以观察到各个酰基
氯的差异:在芳族酰基
氯中,取代发生在5位,而脂族化合物在环外氮处酰化。通过简单的MO模型解释获得的结果。