Abstract
The title compound, C17H19N3O2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the pyran ring has a twisted conformation (5 S 4), with Q = 0.301 (3) Å, θ = 116.7 (6) and ϕ= 213.6 (7)° for molecule A, and Q = 0.364 (2) Å, θ = 113.7 (3) and ϕ = 213.0 (4)° for molecule B. In molecule B, the terminal ethyl group is disordered over two orientations with an occupancy ratio of 0.55 (1):0.45 (1). In the crystal, molecules A and B form very similar but separate R 1 2(7) motifs through N—H⋯O and C—H⋯O hydrogen bonds. The resulting chains along [001] are interlinked by weaker C—H⋯O and C—H⋯π interactions, forming layers parallel to the bc plane.
Highlights
In molecule B, the terminal ethyl group is disordered over two orientations with an occupancy ratio of 0.55 (1):0.45 (1)
In a continuation to our study of the structural features of 1′-benzyl spiro[chromene-2,4′-piperidine]-4-carbonitrile (Rajalakshmi et al, 2012), we report here the crystal structure of the title compound: 4-cyano-N-ethylspiro[chromene-2,4′-piperidine]- 1′-carboxamide
The chains made of molecules B form layers parallel to bc plane owing to formation of an additional C9B—H9B···O2B hydrogen bond
Summary
H atoms treated by a mixture of independent and constrained refinement max = 0.29 e Å3. The title compound, C17H19N3O2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the pyran ring has a twisted conformation (5S4), with Q = 0.301 (3) Å, = 116.7 (6) and ’= 213.6 (7) for molecule A, and Q = 0.364 (2) Å, = 113.7 (3) and ’ =. Molecules A and B form very similar but separate R21(7) motifs through N—. The resulting chains along [001] are interlinked by weaker C—H O and C—. H interactions, forming layers parallel to the bc plane
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