Quinoxaline-2,3-dicarboximide

The original method of synthesis of [c -di(4-terr-butylbenzo)diquinox-alinoporphyrinato]zinc(n) 206 involves the reaction of 5-tert-hutyl-3-(5-tert-butyl-3-oxo-2,3-didihydro- 177-isoindol-1 -ylidenemethyl)- 177-isoindol-1 -one 205 with the excess quinoxaline-2,3-dicarboximide 204 and malonic acid in the 

---