title: Crystal structure of ethyl 2-(4-chlorophenyl)-3-cyclopentyl-4-oxo-1-propyl-imidazolidine-5-carboxylate.
abstract: The title compound, C20H27ClN2O3, was obtained via an original synthesis method. The central heterocyclic ring adopts a shallow envelope conformation, with the N atom bearing the cyclo-pentane ring as the flap [deviation from the other atoms = 0.442 (2) Å]. The cyclo-pentane ring adopts a twisted conformation about one of the CN-C bonds: the exocyclic C-N bond adopts an equatorial orientation. The dihedral angles between the central ring (all atoms) and the pendant five- and six-membered rings are 10.3 (2) and 87.76 (14)°, respectively. In the crystal, C-H⋯O inter-actions link the mol-ecules into [011] chains. A weak C-H⋯Cl inter-action links the chains into (100) sheets. A mechanism for the cyclization reaction is proposed.
authors.affiliation: Laboratoire de Chimie Analytique et Electrochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II, Tunis, Tunisia.
authors.forename: Mohamed Ali
authors.initials: MA
authors.lastname: Tabarki
authors.affiliation: Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia.
authors.forename: Youssef
authors.initials: Y
authors.lastname: Ben Smida
authors.affiliation: Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia ; Institut Préparatoire aux Etudes d'Ingénieurs d'El Manar, El Manar II, 2092 Tunis, Tunisia.
authors.forename: Abderrahmen
authors.initials: A
authors.lastname: Guesmi
authors.affiliation: Laboratoire de Chimie Analytique et Electrochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II, Tunis, Tunisia.
authors.forename: Rafâa
authors.initials: R
authors.lastname: Besbes
keywords: C—H⋯O and C—H⋯O inter­actions; aziridine rearrangement; crystal structure; synthesis