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The asymmetric unit of the title compound, C19H19NOS, contains two independent mol­ecules (A and B), in both of which the 1,3-thia­zepan-4-one ring adopts a chair-type conformation. The dihedral angles between the two phenyl rings are 65.28 (8) and 60.31 (9)° for mol­ecules A and B, respectively. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, resulting in a three-dimensional network.

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The title compound, C20H14N2O3S, has three aromatic rings, viz. (i) a phenyl ring, (ii) a 3-nitro­phenyl and (iii) a 1,3-benzo­thia­zine fused-ring system. The dihedral angle between (i) and (ii) is 85.31 (15)°, between (ii) and (iii) is 81.33 (15)° and between (i) and (iii) is 75.73 (15)°. The six-membered 1,3-thia­zine ring has an envelope conformation with the C atom in the 2-position forming the flap. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, forming a three-dimensional network.
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