Abstract
The ultraviolet absorption spectra of 2', 4'-dihydroxychalcone (V), 4'-(benzyloxy)-2'-hydroxychalcone (VI) and azachalcones (Ila-c, IIIa-c) corresponding to V and VI are reported. These chalcones and azachalcones show two absorption maxima in the wavelength region over 280 mμ, λ1 (345-350 mμ) and λ2 (282 -324 mμ) respectively. It was confirmed that λ1 is due to the electronic nature of the conjugation system of dihydroxybenzoyl group (IA) and λ2 is due to that of cinnamoyl group (IB). Relations between the values of λ1 and λ2, and the position of nitrogen atom in the azachalcones were also discussed.
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Schedule a callMore From: Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan
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