Combine 1 g of anthracene, 0.5 g of maleic anhydride and 17.5 mL of xylene, reflux with stirring in a water bath for 30 minutes. Then cool down and put in a freezer for a few hours, filter and wash with xylene. Recrystallize in xylene. Recover the xylene by distillation.
The solution after the reflux
The crude product crystallized out
The crude product