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Eight neoflavones were synthesized for examination of their spectral properties. In the mass spectra, 2'-oxygenated neoflavones showed characteristic fragments owing to dehydroxylation or demethoxylation. Other spectral data ultraviolet, proton and carbon-13 nuclear magnetic resonance, however, showed no specific features that could be used to characterize the structures.
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Iinuma et al. (1987) studied this question.
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