title: Crystal structure of 1'-ethyl-spiro[chroman-4,4'-imidazolidine]-2',5'-dione: a hydantoine derivative.
abstract: The title compound, C13H13N2O3, a hydantoin derivative, crystallized with two mol-ecules (A and B) in an asymmetric unit. In mol-ecule A, the imidazolidine ring is twisted about the C-N bond involving the spiro C atom, while in mol-ecule B this ring is flat (r.m.s. deviation = 0.010 Å). The pyran rings in both mol-ecules have distorted half-chair conformations. The mean plane of the imidazolidine ring is inclined to the aromatic ring of the chroman unit by 79.71 (11)° in mol-ecule A and 82.83 (12)° in mol-ecule B. In the crystal, pairs of N-H⋯O hydrogen bonds link the individual mol-ecules to form A-A and B-B inversion dimers. The dimers are linked via N-H⋯O and C-H⋯O hydrogen bonds, forming sheets lying parallel to the bc plane, viz. (011). Within the sheets, the A and B mol-ecules are linked by C-H⋯π inter-actions.
authors.affiliation: Department of Chemistry, School of Engineering and Technology, Jain University, Bangalore 562 112, India.
authors.forename: S B
authors.initials: SB
authors.lastname: Benaka Prasad
authors.affiliation: Institution of Excellence, University of Mysore, Manasagangotri, Mysuru 570 006, India.
authors.forename: S
authors.initials: S
authors.lastname: Naveen
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysuru 570 006, India.
authors.forename: M
authors.initials: M
authors.lastname: Madaiah
authors.affiliation: Department of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India.
authors.forename: N K
authors.initials: NK
authors.lastname: Lokanath
authors.affiliation: Department of Chemistry, Science College, An-Najah National University, PO Box 7, Nablus, Palestinian Territories.
authors.forename: Ismail
authors.initials: I
authors.lastname: Warad
authors.affiliation: Department of Physics, Science College, An-Najah National University, PO Box 7, Nablus, Palestinian Territories.
authors.forename: Muneer
authors.initials: M
authors.lastname: Abdoh
keywords: C—H⋯π inter­actions; chroman; crystal structure; hydantoin derivatives; hydrogen bonding; imidazolidine; spiro