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‐Arbuzov‐type”︁ rearrangements; thus, 3a reacts in boiling 2d to afford 6, and heating of the trimethoxyphosphazene 3c in refluxing 1,2‐dichlorobenzene yields the methylamino derivative 7.
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Deeb et al. (1991) studied this question.