Abstract
Microwave irradiation induces the thermal isomerization of pyrazolyl hydrazones to the corresponding azomethine imines which undergo 1,3-dipolar cycloaddition with electron-poor dipolarophiles in a few min with good yields. By classical heating, several dipolarophiles do not react in comparable reaction conditions. Regiochemistry of bipyrazoles obtained from unsymmetrical dipolarophiles has been inferred by spectroscopic experiments.
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