The cations and anions of cyclobutanetetraone poly(phenylhydrazones)
摘要:
Six cyclobutanetetraone poly(arylhydrazones) have been treated with acids and bases, and the structures of the resulting anions and cations studied by UV-Vis absorption and NMR spectroscopy. In acid media, all the hydrazones studied formed cations, which exhibited bathochromic shifts due to the extension of their resonance systems. However, in bases, only some (those which could enolize) formed anions that exhibited hypsochromic shifts; the others were unaltered. (C) 2001 Elsevier Science Ltd. All rights reserved.
Resonance-stabilized phenylazo-ene-phenylimine cations of cyclobutanetetraone derivatives
作者:Hassan S El Khadem、Bruce Coxon
DOI:10.1016/s0008-6215(02)00119-2
日期:2002.11
Cyclobutenedione phenylazo-phenylamines A,ere 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. (C) 2002 Elsevier Science Ltd. All rights reserved.