A Strained Tricyclic Product of a Dipolar 1,3-Cycloaddition Reaction of Diazepine

In the title compound, Diethyl 1,1'-bis(p-chlorophenyl)-6,7a-dimethyl-4,7a,1',4',5',6'-hexahydropyrrolo[4,5-a][1,2,4]triazole-5-spiro-6'-[1,2,4]triazine-3,3'-dicarboxylate, C₂₇H₂₈Cl₂N₆O₄, the tricyclic system is composed of two five-membered rings sharing one side and one six-membered ring having one carbon atom in common with one of the five-membered rings. Strain in this molecule is reflected by significant variations of bond distances and bond angles.

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