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Derivatives of 5H-cyclopenta[2,1-b:3,4-b']-dipyridin-5-one including representatives of the new heterocyclic diquaternary system 4H-7a,9a-diazoniacyclopenta[def ]phenanthrene have been synthesised and the herbicidal and redox properties of the salts studied. The mass spectrum of 5-hydroxy-5-methyl-5H-cyclopenta-[2,1-b: 3,4-b'Jdipyridine is also reported.

Derivatives of 5H-Cyclopenta[2,1-b : 3,4-b']dipyridin-5-one (4,5-Diazafhioren-9-one)