Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 1 (January 2013)

organic compounds

Acta Cryst. (2013). E69, o138    [ doi:10.1107/S1600536812051124 ]


P. Rajalakshmi, N. Srinivasan and R. V. Krishnakumar

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 (5S4), with Q = 0.301 (3) Å, [theta] = 116.7 (6) and [varphi]= 213.6 (7)° for mol­ecule A, and Q = 0.364 (2) Å, [theta] = 113.7 (3) and [varphi] = 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 R12(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...[pi] inter­actions, forming layers parallel to the bc plane.

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