Abstract
1. A method was developed for the synthesis of arylpyrazoles by reaction of aryl 2-chlorovinyl ketones with hydrazine and substituted hydrazines (yields: 60–90%). 2. It was shown that aryl 2-chlorovinyl ketones react with substituted hydrazines in one way only with formation of 1,3-substituted pyrazoles. 3. It was shown that the p-nitrophenylhydrazone of 4-chloro-3-buten-2-one is very readily cyclized to a pyrazole derivative, which confirms the view that the condensation of aryl 2-chlorovinyl ketones with substituted hydrazines passes through the stage of hydrazone formation.
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Schedule a callMore From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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