Thienopyrimidines. VII. Reactions of the 4‐hydrazinothieno[2,3‐<i>d</i>]pyrimidines

Abstract

Abstract The cyclization reactions of the 4‐hydrazinothieno[2,3‐ d ]pyrimidines give s ‐triazolo[1,2‐ c ]‐thieno[3,2‐ e ]pyrimidines and tetrazolo[1,5‐ c ]thieno[3,2‐ e ]pyrimidines.