Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5225611 | Tetrahedron | 2008 | 7 Pages |
Abstract
Three series of 3,7-bis(arylazo)-6-methyl-2-phenyl-1H-imidazo-[1,2-b]pyrazoles were prepared starting from N-aryl 2-oxo-2-phenylethanehydrazonoyl bromides and 5-amino-4-arylazo-3-methyl pyrazoles. The acid dissociation constants pK and pKâ in both the ground and excited states, respectively, 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 1H-bis(arylazo) form in both ground and excited states.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Ahmad Sami Shawali, Mosselhi A. Mosselhi, Farag M.A. Altablawy, Thoraya A. Farghaly, Nagla M. Tawfik,