Abstract
Reduction of 1,1′-(4,6-dinitro-1,3-phenylene)dipyridinium dichloride with SnCl2 afforded dipyrido[1,2-a:1′,2′-a′]benzo[1,2-d:5,4-d]diimidazole which was converted into the corresponding quinone-type 6,13-dione in three simple steps.
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