The historical development of the concept of heterocyclic mesomeric betaines (HMBs) is
briefly reviewed. The common features of heterocyclic mesomeric betaines are discussed …

Pyrazine-fused 1, 2, 6, 6a-tetrazapentalenes (PyTeAP) are zwitterionic tricyclic compounds
exhibiting an original pattern with four consecutive nitrogen atoms. They were obtained by a …

A pyridine-fused triazapentalene shows weak fluorescence in solution and is readily
accessible via nitrene-mediated cyclization. In this study, a modified Cadogan reaction was …

Methyl 4-(1, 3a, 6a-triazapentalen-3-yl) benzoate (TAP1) shows interesting properties as a
small molecule fluorophore. In the search for post-functionalization methods, palladium …

A pyridine-fused triazapentalene shows weak fluorescence in solution, and is readily
accessible via nitrene-mediated cyclization. In this research, a modified Cadogan reaction …