Abstract
Replacement of the central oxygen atom of the heptacyclic condensed diisoquinoline 3 by reaction with hydrazine, hydroxylamine or thiourea in a simple method gave three new heterocyclic ring systems involving 1,2,4,5-tetrazine (7), 1,2,4,5-oxatriazine (8) and 1,2,4,6-tetrazepine (9) central rings.
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