Iron(II) ions are shown to induce a hitherto unknown nitrogen-centred metathesis (‘hydrazine metathesis’) of pyridoxal isonicotinoylhydrazone dimethiodide (1) into the symmetrical hydrazine derivatives pyridoxal azine dimethiodide (7) and dimethiodide of bis-isonicotinoyl hydrazide (8) together with isonicotinoylamide methiodide (9) in a ratio 2 : 1 : 1, respectively.
S. Sarel, S. Avramovici-Grisaru and S. Cohen, J. Chem. Soc., Chem. Commun., 1986, 47 DOI: 10.1039/C39860000047
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