... XI.“ Halogen—Metal Exchange Reaction of 5-Halo-3H-1,2,3-triazolo [4,5—d] pyrimidines with Butyllithium Ken-ichi TANJI,* Hiroyuki KATo and Takeo HIGASHINO School of Pharmaceulical Sciences, University qf'Slzizuoka, 395 Yada, Shizuoka 422, Japan. ...