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In the title compound, C16H15BrN2O4, the six-membered carbocyclic ring of the chromene moiety adopts an envelope conformation with the disordered methyl­ene C atom as the flap. The pyran ring is almost orthogonal to the chloro­phenyl ring, making a dihedral angle of 87.11 (12)°. The amine-group N atom deviates significantly from the pyran ring [0.238 (3) Å]. The mol­ecular structure is stabilized by an intra­molecular N—H...O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, which generate C(8) chains running parallel to the b axis. The chains are linked by C—H...π inter­actions. The methyl­ene-group C atom of the chromene system that is disordered, along with its attached H atoms and the H atoms on the two adjacent C atoms, has an occupancy ratio of 0.791 (7):0.209 (7).

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The title compound, C16H15ClN2O4, contains a chiral centre and crystallizes as a racemate. The methyl­ene group β-positioned to the carbonyl group is partially (21%) disordered. It flips to the opposite sides of the corresponding six-membered carbocycle by −0.304 (3) and 0.197 (11) Å, producing alternative envelope conformations. The planes of the pyran and chloro­phenyl rings form a dihedral angle of 86.25 (9)°. The mol­ecular structure is characterized by an intra­molecular N—H...O inter­action, which generates an S(6) ring motif. The corresponding amino N atom deviates from the plane of the pyran ring by 0.1634 (19) Å. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, forming C(8) chains running parallel to the b-axis direction. The crystal structure also features C—H...π inter­actions.

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The title compound, C16H15N3O6, is asymmetric with a chiral centre located in the pyran ring and crystallizes as a racemate. The six-membered carbocyclic ring adopts an envelope conformation with the central CH2 C atom as the flap. The amine N atom deviates from the mean plane of the pyran ring by 0.1365 (15) Å. The nitro­phenyl ring is almost orthogonal to the pyran ring and the mean plane of the six-membered carbocyclic ring, the dihedral angle between their mean planes being 88.30 (7) and 87.61 (8)°, respectively. The mol­ecular structure is stabilized by an intra­molecular N—H...O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, forming infinite bands lying parallel to (-110) and composed of alternate R22(24) and R24(12) graph-set ring motifs. The crystal structure is further stabilized by C—H...π inter­actions, forming a three-dimensional structure.
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