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In the title compound, C18H17NO3S, the seven-membered thia­zepine ring adopts a slightly distorted sofa conformation. The dihedral angle between the mean plane of the benzothia­zepine ring system and the benzene ring is 5.9 (1)°. The mol­ecular conformation is stabilized by an intra­molecular C—H...S hydrogen bond, which generates an S(7) ring motif. In the crystal, N—H...O and C—H...O hydrogen bonds link inversion-related mol­ecules into dimers, incorporating R12(6) and R22(8) ring motifs; the acceptor O atom is bifurcated. These dimers are further linked by C—H...O hydrogen bonds, forming supra­molecular tapes running along the a axis. These are connected into the three-dimensional architecture by C—H...π inter­actions.

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In the title compound, C16H11Cl2NOS, the seven-membered thia­zepine ring adopts a distorted twist-boat conformation. The dihedral angle between the mean plane of the benzothia­zepine ring system and the benzene ring is 78.6 (1)°. The mol­ecular conformation is stabilized by a weak intra­molecular C—H...Cl hydrogen bond, which generates an S(5) ring motif. In the crystal, pairs of N—H...O hydrogen bonds link inversion-related mol­ecules into dimers, generating R22(8) ring motifs. The crystal packing also features alternating π–π inter­actions between benzothia­zepine benzene rings [inter-centroid distance = 3.740 (3) Å] and dichloro­benzene rings [inter-centroid distance = 3.882 (3) Å] to consolidate a three-dimensional architecture.

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In the title compound C11H9BrCl2O2, which represents the Z isomer, the methyl­acrylate moiety is essentially planar within 0.039 (2) Å and has an extended trans configuration. The benzene ring makes a dihedral angle of 28.3 (1)° with the mean plane of the methyl­acrylate moiety. The crystal packing is characterized by C—H...O hydrogen bonding and halogen–halogen inter­actions [Cl...Cl = 3.486 (3) Å], resulting in the formation of R22(11) ring motifs and connecting the mol­ecules into chains propagating along the b axis.
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