2,3-Dimethylanthraquinone is 2,3-dimethyl substituted anthraquinone and its synthesis has been reported. Electron transfer rate constants for the reaction between radical anions of 2,3-dimethylanthraquinone with benzyl bromide has been evaluated. The photoreactivity of 2,3-dimethylanthraquinone has been evaluated to investigate its usefulness as a photo-reagent for the analysis of ginsenosides using photoreduction fluorescence (PRF) detection method.