Resonance-stabilized phenylazo-ene-phenylimine cations of cyclobutanetetraone derivatives |
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| Authors: | El Khadem Hassan S Coxon Bruce |
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| Affiliation: | Department of Chemistry, The American University, 4400 Massachusetts Avenue, NW, Washington, DC 20016, USA. helk@erols.com |
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| Abstract: | Cyclobutenedione phenylazo-phenylamines were found to exhibit bathochromic shifts in acidic media and hypsochromic shifts in basic media, like phenylazo-phenylhydrazones. The bathochromic shifts are due to the formation of resonance-stabilized cations and the hypsochromic shifts to enolization. The phenylazo-phenylamines and their cations and anions have been studied by NMR spectroscopy. |
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