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In the title compound, C27H24N2O3, the pyrroldine ring adopts a twist conformation, while the six-membered pyran­one ring of the coumarin ring system is in a sofa conformation. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules into inversion R22(8) dimers. These dimers are further connected via C—H...O hydrogen bonds.

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In the title compound, C18H15NO2, the dihedral angle between the two benzene rings is 74.8 (1)°. The carbonitrile chain is almost linear, the C—C—N angle being 176.2 (2)°. In the crystal, π–π inter­actions [centroid–centroid distance = 3.842 (1) Å] are observed.

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In the title compound, C24H19ClN2O3S, the sulfonyl-bound benzene ring forms dihedral angles of 38.1 (2) and 81.2 (1)°, respectively, with the formyl benzene and benzene rings. The mol­ecular conformation is stabilized by a weak intra­molecular C—H...O hydrogen bond, which generates an S(5) ring motif. The crystal packing is stabilized by C—H...O hydrogen bonds, which generate C(7) zigzag chains along [010] and R33(19) ring motifs along [010]. The crystal packing is further stabilized by C—Cl...π inter­actions [Cl...centroid = 3.456 (2) Å and C—Cl...centroid = 173.4 (2)°].

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The C=C bond in the title compound, C15H15NO4S, has a Z configuration. The thia­zolidine ring is essentially planar [maximum deviation = 0.008 (1) Å for the N atom] and is oriented at a dihedral angle of 59.1 (1)° with respect to the benzene ring. In the crystal, pairs of C—H...O hydrogen bonds link centrosymmetrically related mol­ecules into dimers, generating R22(18) ring motifs. The crystal packing is further stabilized by C—H...π and C—O...π [O...centroid = 3.412 (2) Å and C—O...centroid = 115.0 (1)°] inter­actions.

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The title compound, C19H18O5, crystallizes with two independent mol­ecules (A and B) in an asymmetric unit in both of which the two aromatic rings are in a bis­ectional orientation as evidenced by the dihedral angle between them [41.7 (1)° in mol­ecule A and 35.6 (1)° in mol­ecule B]. Both mol­ecules adopt an E configuration with respect to the C=C bond. An intra­molecular C—H...O hydrogen-bond occurs in mol­ecule A. The crystal packing features inter­molecular C—H...O inter­actions.
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