Substituted benzoyl azides normally yield the correspondingly substituted isocyanates but when a dialkylated amino group is in the 2-position, in addition to the isocyanate, the 1,1-dialkylated indazol-1-ium-3-olate is produced. The ratio of the two products is very variable depending upon the substitution in the benzene ring. Largest yields of the zwitterionic products were found when there was a substituent in the 3-position regardless of whether the substituent was electron-donating or -withdrawing.
取代苯甲酰
叠氮通常产生相应的取代
异氰酸酯,但当二烷基
氨基团位于2位时,除了
异氰酸酯外,还生成1,1-二烷基化的
吲唑-1-鎓-3-氧酸盐。这两种产物的比例非常可变,取决于苯环上的取代情况。无论3位的取代基是电子供体还是电子受体,当3位有取代基时,偶极离子的产率最高。