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The six-membered thia­zine ring in the title compound, C16H15NOS, adopts a half-chair conformation, with the S atom forming the back of the chair. The base of the chair has a slight twist reflected in the r.m.s. deviation (0.0756 Å) of those five atoms from the plane defined by them. The phenyl substituents are almost perpendicular to each other [dihedral angle 87.06 (9)°]. In the crystal, mol­ecules are linked into chains parallel to the c axis through C—H...O inter­actions.

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In the title compound, C20H15NOS, the dihedral angle between the phenyl rings is 74.25 (6)°. The six-membered 1,3-thia­zine ring has an envelope conformation with the C atom at the 2-position forming the flap. The crystal structure features weak C—H...O inter­actions, which lead to the formation of a tape motif along [110].

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In the racemic title compound, C19H14N2OS, the two phenyl substituents on the 1,3-thia­zine ring are almost perpendicular to the pyridine ring which is fused to the thia­zine ring [inter-ring dihedral angles = 87.90 (8) and 85.54 (7)°]. The dihedral angle between the two phenyl rings is 75.11 (7)°. The six-membered thia­zine ring has an envelope conformation with the ortho-related C atom forming the flap. The crystals exhibit face-to-edge aromatic-ring interactions with the nearest C—H...C distance equal to 3.676 (3) Å.

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The title compound, C15H13NOS, is a chiral mol­ecule crystallized as a racemate, with two molecules in the asymmetric unit. In each of the mol­ecules, the five-membered thia­zine ring has an envelope conformation, with the S atom forming the flap. In one mol­ecule, the angle between the two phenyl-ring planes is 82.77 (7)°, while in the other it is 89.12 (6)°. In the crystal, mol­ecules are linked into chains along the b-axis direction by C—H...O hydrogen bonds.
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