<![CDATA[Four (4) hydroxy dimethoxy chalcones derivatives were synthesized by Claisen-Schmidt condensation of hydroxyacetophenone with 3,4-dimethoxybenzaldehyde using conventional method and grinding technique. The synthesized compounds were characterized by spectroscopy (IR, 1H-NMR and 13C-NMR). Synthesis of the hydroxy dimethoxy chalcone using grinding method is better than the conventional method. The synthesis using grinding method require a low concentration base, shorter reaction (15min) and higher yield (70-84%).  The antioxidant activity of the compounds was determined by DPPH method, showed that  2,5-dihydroxy-3,4-dimethoxy chalcone have the highest antioxidant activity.Key word: hydroxy dimethoxy chalcone, Claisen-Schmidt condensation, grinding, DPPH method]]>
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