Proton magnetic resonance spectra can be used to locate methyl groups at the 1-, 2, -or exocyclic amino-positions of methylated 5-amino-derivatives of tetrazole except where, as in the case of tetrazol-5-ylhydrazones, coincidence of the signals occurs.
F. L. Scott, R. N. Butler and J. Feeney, J. Chem. Soc. B, 1967, 919 DOI: 10.1039/J29670000919
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