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The mol­ecule of the title heteroaryl chalcone derivative, C13H11NOS, exists in a trans-configuaration and is almost planar with a dihedral angle of 3.73 (8)° between the phenyl and thio­phene rings. An intra­molecular N—H...O hydrogen bond generates an S(6) ring motif. In the crystal, two adjacent mol­ecules are linked into a dimer in an anti-parallel face-to-face manner by a pair of C—H...O inter­actions. Neighboring dimers are further linked into chains along the c-axis direction by N—H...N hydrogen bonds.

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The title heteroaryl chalcone derivative, C17H17NO4, is close to planar: the dihedral angle between the pyridine and benzene rings is 3.71 (11)° and the meth­oxy C atoms deviate from their attached ring by 0.046 (3), −0.044 (2) and 0.127 (3) Å. The disposition of the pyridine N atom and the carbonyl group is anti [N—C—C—O = −177.7 (2)°]. In the crystal, mol­ecules are linked by weak C—H...N and C—H...O inter­actions into (100) sheets and an aromatic π–π stacking inter­action between the pyridine and benzene ring, with a centroid–centroid separation of 3.7036 (14) Å also occurs.

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In the title compound, C18H15N3O5S, the approximately planar quinazoline ring system [maximum deviation = 0.097 (3) Å] forms a dihedral angle of 76.53 (19)° with the phenyl ring. The terminal -C(=O)—O—C group is disordered over two sets of sites with a site-occupancy ratio of 0.811 (17):0.189 (17). In the crystal, mol­ecules are linked via weak C—H...O hydrogen bonds into sheets parallel to the ac plane.
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