Isoflavones, flavanones and dihydroflavonols all give similar UV spectra as a result of their having little or no conjugation between the A- and B-rings. They are all readily distinguished from flavones and flavonols by their UV spectra, which typically exhibit an intense Band II absorption with only a shoulder or low intensity peak representing Band I.
CITATION STYLE
Mabry, T. J., Markham, K. R., & Thomas, M. B. (1970). The Ultraviolet Spectra of Isoflavones, Flavanones and Dihydroflavonols. In The Systematic Identification of Flavonoids (pp. 165–226). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-88458-0_6
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