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The electronic structure of the flavylium cation (1) and those of some of its hydroxylated derivatives were studied by semiempirical and ab initio molecular orbital methods. This ion presents a small resonance in the pyrylium group (C-ring), which is not conjugated to the phenyl group (B-ring). The planarity of the molecule is due to a hydrogen bond between the oxygen atom in C-ring and some hydrogen...
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