A novel carboxylic acid azide decomposition to yield 1,1,7-trimethylindazol-3-ylio oxide
作者:Norman M. Waldron、Majid Montevalli、Shamim Azam、Peter C. Dasopoulos
DOI:10.1039/c39950000081
日期:——
Thermal decomposition of 2-dimethylamino-3-methylbenzazide produced, instead of the expected isocyanate, a high yield of the isomeric cyclised product 1,1,7-trimethylindazol-3-ylio oxide; a single-crystal X-ray diffraction study shows delocalisation of the negative charge though little conjugation of the unsaturation of the five-membered ring with the benzene ring.
2-dimethylamino-3-methylbenzazide 的热分解产物不是预期的异氰酸酯,而是高产率的异构环化产物 1,1,7-三甲基吲唑-3-基氧化物;单晶 X 射线衍射研究表明,虽然五元环的不饱和度与苯环的共轭程度很低,但负电荷却发生了分散。