Abstract 6-Azidotetrazolo [1, 5-b] pyridazine („3, 6-Diazidopyridazine”, 1) reacts at ambient temperature with phosphanes or phosphites 2a–c to yield the phosphazenes 3a–c. In contrast to literature reports, the tetrazolopyridazines 1, and 3a, b react with phosphanes to yield 3, 6-bis (phosphoranylideneamino) pyridazines 4; however, the required temperature is rather high (180 C). The use of phosphites instead of phosphanes leads to „Michaelis- ...
![triphenyl(tetrazolo[1,5-b]pyridazin-6-ylimino)-λ5-phosphane Structure](https://image.chemsrc.com/caspic/337/37139-10-9.png)