作者:G.C. Barrett、R. Walker
DOI:10.1016/s0040-4020(01)93775-5
日期:1976.1
4-Substituted 2-phenylthiazole-5-thiols 3 undergo addition reactions of a different type from those of their oxygen analogues, the oxazol- and thiazol-5(4)-ones, since they exist in solution entirely in the thioenol tautomeric form. Their addition reactions involve only the exocyclic sulphur atom, and they behave as typical heteroaromatic thiols towards unsaturated systems, giving sulphides. A mesoionic
4-取代的2-苯基噻唑-5-硫醇3经历了与其氧类似物恶唑-和噻唑-5(4 )-的类型不同的加成反应,因为它们完全以硫烯醇互变异构形式存在于溶液中。它们的加成反应仅涉及环外硫原子,它们表现为对不饱和体系的典型杂芳族硫醇,生成硫化物。然而,中离子噻唑-5-硫醇显示出具有环加成反应性,与不饱和系统进行的环加成-挤出反应与氧类似物的公认反应相当。