Abstract
Using gas-liquid chromatography and PMR spectra, it is shown that condensation of tiglic aldehyde and methylhydrazine gives, in addition to the corresponding methylhydrazone, a mixture of stereoisomeric, 1,4, 5-trimethyl-Δ2-pyrazolines and 1,3, 4-trimethyl-Δ2-pyrazoline. Thus the reaction of formation of pyrazolines from unsaturated carbonyl compounds and hydrazines is not stereospecific and may involve hitherto unknown rearrangements.
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