Four stable carbenes, 1-tert-butyl-3,4-diaryl-1,2,4-triazol-5-ylidenes 1a-d, including new fluorine-containing compounds 1c,d, react with a malonic ester to afford heterocyclic zwitterionic compounds 5a-d. The reactions with more acidic compounds (ethyl acetoacetate, malononitrile and 1,3-dimethylbarbituric acid) proceed with substrate deprotonation to form the respective azolium salts 6a-c. The X-ray
包括新的含
氟化合物1c,d在内的四种稳定的羧
甲酸酯1-叔丁基-3,4-二芳基-
1,2,4-三唑-5-亚烷基1a-d与
丙二酸酯反应生成杂环两性离子化合物5a-d。与更多酸性化合物(
乙酰乙酸乙酯,
丙二腈和
1,3-二甲基巴比妥酸)的反应进行底物去质子化反应,形成各自的盐6a-c。还确定了5a的X射线晶体结构。