Ring Closure of Heterocyclic Systems by Potassium-Graphite Intercalat - C8K

Article abstract of DOI:10.1055/s-1987-27889

Potassium-graphite intercalate C8K is the reagent of choice for the ring closure of the dianions of 2,3-diarylquinoxalines derivatives 1-3 to the dianions of dibenzophenazine derivatives 4-6 in high yields and high degree of purity.This process appears to occur via a thermal electrocyclic process of the dianions.