Synthesis and Tautomeric Structure of 3, 7-bis(arylazo)-2, 6-dimethyl-1H-imidazo[1, 2-b]pyrazoles. (March 2013)

• Record Type: Journal Article
• Authors: Shawali, Ahmad Sami; Abdallah, Magda A.; Shehata, Mohamed R.; Kandil, Mohamed
• Is Part Of: Journal of chemical research. Volume 37:Number 3(2013)
• Page Start: 127
• Page End: 130
• Publication Date: 2013-03
• Subjects: hydrazonoyl halides -- azo compounds -- pyrazoles -- imidazo[1, 2-b]pyrazoles; Chemistry -- Research -- Periodicals; Chemistry -- Periodicals; 540.5
• DOI: 10.3184/174751913X13588723344455
• Languages: English
• ISSNs: 1747-5198

Abstract

Three series of 3, 7-bis(arylazo)-2, 6-dimethyl-1 H -imidazo[1, 2- b ]pyrazoles were prepared starting from N -aryl-2-oxo-propanehydrazonoyl chlorides. The acid dissociation constants p K a were determined and correlated with the Hammett equation. The results of such correlations together with the spectroscopic data indicated that the title compounds exist predominantly in the 1 H -bis(arylazo) form.