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- W2040472013 abstract "Ultraviolet spectra of fifteen natural of synthetic 6- and 8-methylflavones, with hydroxy group at C-5 and hydroxy or methoxy groups at C-7, were recorded in methanol and in presence of neutral or acidic aluminium chloride. Several spectral characteristics may be deduced which are typical of the C-methyl group position and distinguish these compounds from their 6-and 8-methoxy homologues. Moreover, for flavones of each the above-mentioned groups, B-ring substitution at C-4′, C-3′, 4′ and C-3′, 4′, 5′ (hydroxy and/or methoxy groups) may be differentiated. On the other hand, spectral differences are unimportant between 8-methyl-flavones and 8-(p-hydroxybenzyl)flavones, in a similar manner mono- or disubstituted at C-4′ or C-3′, 4′. During this work three 6-methylflavones and four 8-methylflavones were newly synthesized." @default.
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- W2040472013 date "1998-06-01" @default.
- W2040472013 modified "2023-09-26" @default.
- W2040472013 title "Synthesis of 5-hydroxy-6- and 8-methylflavones and their ultraviolet spectral differentiation" @default.
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- W2040472013 doi "https://doi.org/10.1016/s0031-9422(97)00919-9" @default.
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