Crystal structure of 8-[7, 8-bis(4-chlorobenzoyl)-7H-cyclopenta[a]acenaphthylen-9-yl]naphthalene-1-carboxylic acid

Jomon P. Jacob, M. Sithambaresan*, Christy Kunjachan, M. R. Prathapachandra Kurup, W. T A Harrison (Editor)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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The title compound, C40H22Cl2O4, was formed by a Michael-Aldol domino reaction sequence, which coupled acenaphthenequinone with 4-chloroaceto-phenone in the presence of KOH in methanol. The dihedral angles between the central cyclopenta[a]acenaphthylene fused-ring system (r.m.s. deviation = 0.066 Å) and the 4-chlorobenzoyl rings are 62.25(10) and 70.19(10)°. The dihedral angle between the central ring system and the naphthoic acid grouping is 62.46 (7)°. This twisting of the pendant rings facilitates the formation of an intramolecular aromatic π-π stacking interaction between the 4-chlorobenzoyl and naphthoic acid rings, with centroid-centroid distances of 3.4533 (16) and 3.5311 (16) Å, and a C - H⋯π interaction between one of the H atoms of the central moiety and the 4-chlorobenzoyl ring with an H⋯π distance of 2.57 Å. In the crystal, carboxylic acid inversion dimers generate R 22(8) loops. The dimers are linked by weak C - H⋯O and C - H⋯Cl hydrogen bonds and C - H⋯π interactions, generating a three-dimensional architecture.

Original languageEnglish
Pages (from-to)38-41
Number of pages4
JournalActa Crystallographica Section E: Structure Reports Online
Issue number1
Publication statusPublished - 1 Jan 2015

Bibliographical note

JPJ and CK are obliged to Dr S. Prathapan for introducing them to the field of domino reactions. SAIF (STIC) CUSAT, Kochi, India, provided spectroscopic, analytical and single crystal X-ray diffraction data.


  • 4-chloroacetophenone
  • Acenaphthenequinone
  • Crystal structure
  • Domino reaction
  • Hydrogen bonding


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