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Facile Synthesis of Tetrapyrido[2,3-a:3',2'-c:2",3"-h:3'",2'"-j]phenazine
31 December 2000 (online)
The title compound, a potential ligand for transition metals, was prepared by coupling of two 4,7-phenanthroline-5,6-dione molecules in presence of ammonia under reductive conditions. A straightforward synthesis of 4,7-phenanthroline-5,6-dione is also presented.
ligand - heterocycle - pyrazine