Diethyl 6,9-dibromo-1,4-dioxo-1,2,3,4,5,10-hexahydro-2,3,4a,10a-tetraazabenzo[g]cyclopenta[cd]azulene-2a,10b-dicarboxylate

Abstract

The title compound, C18H18Br2N4O6, is an important inter­mediate for the synthesis of mol­ecular clips. Inter­molecular N—H⋯O hydrogen bonds form eight‐membered rings. No π–π stacking is observed.

6,9-Dibromo-2a,10b-diphenyl-2a,5,10,10b-tetrahydro-2H,3H-2,3,4a,10a-tetraazabenzo[g]cyclopenta[cd]azulene-1,4-dione monohydrate

“…1 and Table 1). The crystal structure of an analog, 6,9-dibromo-1,4-dioxo-1,2,3,4,5,10-hexahydro-2,3,4a,10a-tetraaza-benzo[g]cyclopenta [cd]azulene-2a,10b-dicarboxylic acid diethyl ester, was reported previously (She et al, 2005).…”