Pyridazine derivatives and related compounds. Part 141. Photolysis of 3-diazo-4, 5-diphenylpyrazolo [3, 4-c] pyridazine

AM Amer, MF Zayed, A Deeb…

Index: Amer, Atef Mohamed; Zayed, Mohamed Fouad; Deeb, Ali; Ali, Ahmed Journal of Chemical Research, 2005 , # 10 p. 643 - 647

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Abstract

The photochemistry of 3-diazopyrazolopyridazine has been investigated. The irradiation of 3- diazo-4, 5-diphenylpyrazolo [3, 4-c] pyridazine in various solvents forms a carbene intermediate, which transforms into 3-substituted derivatives. For photolysis in the presence of acetylacetone or ethyl acetoacetate the coupling reactions which occur at the methylene group are faster than carbene formation, and can lead to direct cyclisation into condensed ...