Azole N-oxides. Part III. Thermal rearrangements of 1-methoxypyrazole 2-oxides
Abstract
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.