title: Crystal structure of (5'S,8'S)-3-(2,5-di-methyl-phen-yl)-8-meth-oxy-3-nitro-1-aza-spiro-[4.5]decane-2,4-dione.
abstract: The title compound, C18H22N2O5, was synthesized by nitrification of its enol precursor. The pyrrolidine ring plane adopts a twisted conformation about the C-C bond linking the spiro centre and the C=O group remote from the N atom. It makes dihedral angles of 71.69 (9) and 88.92 (9)°, respectively, with the benzene ring plane and the plane defined by the four C atoms that form the seat of the of the cyclo-hexane chair. At the spiro centre, the NH group is axial and the C=O group is equatorial with respect to the cyclo-hexane ring. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds generate R 2 (2)(8) loops. The dimers are linked by C-H⋯O inter-actions, generating a three-dimensional network.
authors.affiliation: Medical College, Quzhou College of Technology, Quzhou 324000, People's Republic of China.
authors.forename: Gao-Bo
authors.initials: GB
authors.lastname: Hu
authors.affiliation: Medical College, Quzhou College of Technology, Quzhou 324000, People's Republic of China.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Jiang
authors.affiliation: Medical College, Quzhou College of Technology, Quzhou 324000, People's Republic of China.
authors.forename: Jiang-Yan
authors.initials: JY
authors.lastname: Li
authors.affiliation: Medical College, Quzhou College of Technology, Quzhou 324000, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Rao
authors.affiliation: Medical College, Quzhou College of Technology, Quzhou 324000, People's Republic of China.
authors.forename: Li-Yuan
authors.initials: LY
authors.lastname: Jiang
keywords: 1-aza­spiro­[4.5]decane-2,4-dione; crystal structure; hydrogen bonding; pesticide; spiro­tetra­mat