have been prepared for the first time. The azido/tetrazole equilibria of the most soluble compound 4 has been studied in six solvents. The resulting tautomeric equilibrium constants have been compared with those of 2-azido-4,5-dimethylthiazole 1 and 2-azidobenzothiazole 2. The rather insoluble NH derivative 3 when dissolved in DMSO contains 66% of tetrazole 3b while the corresponding anion (obtained
首次制备了化合物2-
叠氮基-6 H-
噻唑并[5,4- a ] ac啶酮11-one 3和2-
叠氮基-6-丁基
噻唑并[5,4 - a ] acridin-11-one 4。已经在六种溶剂中研究了最易溶化合物4的
叠氮基/
四唑平衡。已将所得的互变异构平衡常数与2-
叠氮基-
4,5-二甲基噻唑1和2-
叠氮基
苯并噻唑2比较。当溶于
DMSO中时,难溶的NH衍
生物3含有66%的
四唑3b,而相应的阴离子(通过添加氢化
钠获得)全部存在于
四唑13b中 形式。