名称:
Effect of intramolecular hydrogen bond on the azide-tetrazole equilibrium of 5-(2?-hydroxyphenyl)tetrazolo[1,5-a]pyrimidine,-tetrazolo[1,5-c]pyrimidme, -tetrazolo[1,5-c]quinazoline, and 7-(2?-hydroxyphenyl)tetrazolo[1,5-c]pyrimidine
摘要:
The intramolecular hydrogen bond between the phenolic hydroxyl and the pyrimidine nitrogen atom in the title compounds exerts a destabilizing effect on the tetrazole ring and shifts the azide-tetrazole equilibrium toward the azide farm, especially in the case of tetrazolo[c]pyrimidine and -[c]quinazoline. It has been found that the introduction of a methoxy group into the ortho-position of the phenyl fragment stabilizes the tetrazole tautomer more efficiently than introduction of this group into the para-position.