1-Methoxy-3,4,5-trimethylpyrazole 2-oxide and 1-methoxy-4,5-dimethyl-3-phenylpyrazole 2-oxide undergo spontaneous thermal rearrangements to the isomeric 5-methoxy-compounds. 1-Methoxy-3,4-dimethyl-5-phenylpyrazole 2-oxide rearranges more slowly to give a mixture of the 3-, 4-, and 5-methoxy-isomers.
F. T. Boyle and R. A. Y. Jones, J. Chem. Soc., Perkin Trans. 1, 1973, 167 DOI: 10.1039/P19730000167
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