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Synthesis of 1-substituted 5-aryl-3-styryl-2-pyrazolines and 3-aryl-5-styryl-2-pyrazolines by the reaction of dibenzylideneacetones and E,E-cinnamylideneacetophenones with hydrazines

✍ Scribed by Albert Lévai; József Jekó

Publisher: Journal of Heterocyclic Chemistry
Year: 2006
Tongue: English
Weight: 411 KB
Volume: 43
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570430524

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✦ Synopsis

The reaction of dibenzylideneacetones or E,E-cinnamylidene-acetophenones and hydrazine hydrate provided 1-propionyl derivatives of 5-aryl-3-styryl-2-pyrazolines and 3-aryl-5-styryl-2-pyrazolines. These unsaturated ketones afforded 1-(2-carboxyphenyl) or 1-(4-carboxyphenyl) 5-aryl-3-styryl-2-pyrazolines and 1-(4-carboxyphenyl) derivatives of 3-aryl-5-styryl-2-pyrazolines on treatment with (2-carboxyphenyl)hydrazine or (4-carboxyphenyl)hydrazine in hot acetic acid. Structures of all new 2-pyrazolines have been elucidated by microanalyses and a combined utilization of various spectroscopic methods.

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