Resonance-stabilized phenylazo-ene-phenylimine cations of cyclobutanetetraone derivatives
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...
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Veröffentlicht in: | Carbohydrate research 2002-11, Vol.337 (21), p.2161-2170 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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.
Cyclobutenedione phenylazo-phenylamines were found to exhibit bathochromic shifts in acidic media and hypsochromic shifts in basic media, like phenylazo-phenylhydrazones, a phenomenon attributed, respectively, to the formation of resonance-stabilized cations and to enolization. |
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ISSN: | 0008-6215 1873-426X |
DOI: | 10.1016/S0008-6215(02)00119-2 |