Rearrangements in the formation of pyrazolines from alkyl hydrazines and unsaturated carbonyl compounds |
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Authors: | B. V. Ioffe V. V. Tsibul'skii |
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Affiliation: | (1) Leningrad State University, USSR |
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Abstract: | The isomeric composition of the 2-pyrazolines obtained by the condensation of croton aldehyde and methyl vinyl ketone with C1–C4 monoalkyl hydrazines has been studied by the GLC method. It has been shown that in the reaction of croton aldehyde with isopropyl hydrazine, isobutyl hydrazine, and, to a smaller extent, with methyl hydrazine, in addition to the 1-alkyl-5-methyl-2-pyrazolines the 1, 3-isomers are formed. In other cases, only one pyrazoline, corresponding to the structure of the carbonyl compound, is formed. Eight previously-unknown dialkyl-2-pyrazolines are described. |
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