All articles of this category Potassium-graphite intercalate C 8 K is the reagent of choice for the ring closure of the dianions of 2,3-diarylquinoxalines derivatives 1-3 to the dianions of dibenzo[ a,c ]phenazine derivatives 4-6 in high yields and high degree of purity. This process appears to occur via a thermal electrocyclic process of the dianions.
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Tamarkin et al. (1987) studied this question.