Reactions of 3, 4-dimethyl-5- (2-hydroxyethyl) thiazolium iodide (I) and 3-benzyl-4-methyl-5- (2-hydroxyethyl) thiazolium bromide (I') with diaryl carbodiimides afforded corresponding (1 : 1) adduct (III, III') and (1 : 2) cycloadduct (IV, IV'). Product distribution in these reactions was largely effect by a substituent of carbodiimide and of thiazolium nitrogen. For para substituent in carbodiimide in the reaction with (I), the product ratio IV/III was increased in the order Me
3, 4-二甲基-5-(2-羟乙基)碘化噻唑鎓(I)和 3-苄基-4-甲基-5-(2-羟乙基)溴化噻唑鎓(I')与二芳基碳二亚胺反应,可得到相应的(1 : 1)加合物(III, III')和(1 : 2)环加合物(IV, IV')。这些反应中的产物分布在很大程度上受到碳二亚胺和噻唑氮取代基的影响。碳二亚胺中的对位取代基在与(I)的反应中,产物比 IV/III 按照 Me
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