Studies on Mesoionic Compounds. IX. Synthesis of Bicyclic Mesoionic Compounds

Reaction of the mesoionic 4-amino-1, 2, 4-triazolium-3-thiolates (I) with cyanogen bromide gave bicyclic mesoionic compounds (III) related to the product (II) obtained on treatment of I with phosgene. Benzoylation, tosylation, and nitrosation at the exocyclic nitrogen of III were also investigated.