title: 4-Cyano-N-ethyl-spiro-[chromene-2,4'-piperidine]-1'-carboxamide.
abstract: The title compound, C17H19N3O2, crystallizes with two independent mol-ecules (A and B) in the asymmetric unit. In both mol-ecules, the pyran ring has a twisted conformation ((5)S4), with Q = 0.301 (3) Å, θ = 116.7 (6) and ϕ= 213.6 (7)° for mol-ecule A, and Q = 0.364 (2) Å, θ = 113.7 (3) and ϕ = 213.0 (4)° for mol-ecule B. In mol-ecule B, the terminal ethyl group is disordered over two orientations with an occupancy ratio of 0.55 (1):0.45 (1). In the crystal, mol-ecules A and B form very similar but separate R1(2)(7) motifs through N-H⋯O and C-H⋯O hydrogen bonds. The resulting chains along [001] are inter-linked by weaker C-H⋯O and C-H⋯π inter-actions, forming layers parallel to the bc plane.
authors.affiliation: Department of Physics, Thiagarajar College, Madurai 625 009, India.
authors.forename: P
authors.initials: P
authors.lastname: Rajalakshmi
authors.forename: N
authors.initials: N
authors.lastname: Srinivasan
authors.forename: R V
authors.initials: RV
authors.lastname: Krishnakumar