title: A chain of π-stacked molecules in 4-(2-chlorophenyl)pyrrolo[1,2-a]quinoxaline and a hydrogen-bonded sheet in (4RS)-4-(1,3-1,3-benzodioxol-6-yl)-4,5-dihydropyrrolo[1,2-a]quinoxaline.
abstract: In the molecule of 4-(2-chlorophenyl)pyrrolo[1,2-a]quinoxaline, C17H11ClN2, (I), the bond lengths are consistent with electron delocalization in the two outer rings of the fused tricyclic system, with a localized double bond in the central ring. The molecules of (I) are linked into chains by a π-π stacking interaction. In (4RS)-4-(1,3-benzodioxol-6-yl)-4,5-dihydropyrrolo[1,2-a]quinoxaline, C18H14N2O2, (II), the central ring of the fused tricyclic system adopts a conformation intermediate between screw-boat and half-chair forms. A combination of N-H···O and C-H···π(arene) hydrogen bonds links the molecules of (II) into a sheet. Comparisons are made with related compounds.
authors: Departamento de Química, Universidad de Valle, AA 25360 Cali, Colombia.
authors: Juan C
authors: JC
authors: Castillo
authors: Rodrigo
authors: R
authors: Abonía
authors: Justo
authors: J
authors: Cobo
authors: Christopher
authors: C
authors: Glidewell
mesh_terms: D018360:Crystallography, X-Ray; D004583:Electrons; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D015394:Molecular Structure; D011758:Pyrroles / Q000737:chemistry*; D011810:Quinoxalines / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C583155:(4RS)-4-(1,3-1,3-benzodioxol-6-yl)-4,5-dihydropyrrolo(1,2-a)quinoxaline; C583154:4-(2-chlorophenyl)pyrrolo(1,2-a)quinoxaline; D011758:Pyrroles; D011810:Quinoxalines