2 Procedures 1)KMnO4(1 g)+ H2,O(10 mL), stirred at 75oC; 2)Add acetylacetone 4.4 g(4. 8 mL) dropwise and stir at 75 oC for 10 min 3)Remove heating, cooled with ice-water bath for 10 min 4)Filtered, washed with H,O and 30% Etoh, then dried to constant weight 5)Recrystallization with acetone-petroleum ether ow-.jProcedures 1）KMnO4 (1 g) + H2O (10 mL), stirred at 75 oC; 2）Add acetylacetone 4.4 g (~ 4.8 mL) dropwise and stir at 75 oC for 10 min; 3）Remove heating, cooled with ice-water bath for 10 min ； 4）Filtered, washed with H2O and 30% EtOH, then dried to constant weight; 5） Recrystallization with acetone-petroleum ether