alkenes. However, the thiazolones undergo cycloaddition-extrusion reactions with alkynes and with heterocumulenes, in many cases giving products identical with those from corresponding oxazolones. Examples of the influence of thiazolone substituents on the course of these cycloaddition reactions are provided by comparison of results of reactions of differently-substituted mesoionic thiazol-5-ones with phenyl
与中离子性的
恶唑-5-酮的行为相反,相应的
噻唑-5-酮可与缺电子的烯烃形成稳定的环加合物。然而,
噻唑酮类与
炔烃和异
枯烯类进行环加成-挤出反应,在许多情况下得到的产物与相应的
恶唑酮类产物相同。
噻唑酮取代基对这些环加成反应过程的影响的实例是通过比较不同取代的中离子
噻唑-5-酮与
异氰酸苯酯,异
硫氰酸苯酯或
呋喃二酸二甲酯反应的结果而提供的。