Preparation of 3,5-diarylpyrazoles

Details Preparation of 3,5-diarylpyrazoles Preparation of 3,5-diarylpyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/12 (2006.01)

Patent

CA 2209486

A process for producing 3,5-diaryl pyrazolene of general formula (I), where R1 and R3 are possibly substituted aryl radicals, R2 is hydrogen, C1-C5 alkyl and possibly substituted aryl, in which hydrazine hydrate is reacted with 1,3 diaryl propenonene of general formula (II), where R1, R2 and R3 have the above meanings, in sulphuric acid in the presence of iodine or an iodine compound.

L'invention concerne un procédé de préparation de 3,5-diarylpyrazolène de la formule générale (I) dans laquelle les substituants ont la notation suivante: R<1> et R<3> désignent des restes aryle éventuellement substitués, R<2> désigne hydrogène, alkyle C1-C8 et aryle éventuellement substitué. On fait réagir de l'hydrate d'hydrazine avec du 1,3-diarylpropénonène de la formule générale (II), dans laquelle les substituants R<1>, R<2> et R<3> ont la notation mentionnée ci-dessus, dans de l'acide sulfurique en présence d'iode ou d'un composé iodé.

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