抄録
2', 3', 4'-Triacetyl-FMN has been transformed by selec-tive radical bromination into 2', 3', 4'-triacetyl-8α-bromo-FMN, and the following hydrolysis of the latter has afforded 8α-hydroxy-FMN. The presence of the hydroxy group in the 8α position of 8α-hydroxy-FMN is confirmed by its acetylation into 2', 3'-diacetyl-8α-acetoxyribofla-vin-4', 5'-cyclophosphate, The absorption spectra of the synthesized compounds have shown the reduction of the extinction ratios of the first and second absorption maxima in comparison with the extinction of the same maxima for 8α-hydroxyriboflavin, Unlike FMN, fluorescence quenching for 8α-hydroxy-FMN has been found.
