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Synthesis 1987; 1987(2): 196-197
DOI: 10.1055/s-1987-27889
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Ring Closure of Heterocyclic Systems by Potassium-Graphite Intercalat - C8K

Dov Tamarkin* , Yoram Cohen, Mordecai Rabinovitz
  • *Department of Organic Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Publication Date:
12 September 2002 (online)

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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 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.