ChemInform Abstract: Regioselective Iminophosphorane‐Mediated Anellation of a 1,3,4‐ Thiadiazole Ring into a 1,2,4‐Triazine Ring: Preparation of Novel Mesoionic Compounds Derived from (1,3,4)Thiadiazolo(2,3‐c)‐ and (1,3,4) Thiadiazolo(3,2‐d)(1,2,4)triazines. | Publicación