title: (Z)-3-(3,4-Di-meth-oxy-benz-yl)-1,5-benzo-thia-zepin-4(5H)-one.
abstract: In the title compound, C18H17NO3S, the thia-zepine ring adopts a slightly distorted twist-boat conformation. The dihedral angle between the mean plane of the benzo-thia-zepin ring system and the benzene ring is 60.3 (1)°. In the crystal, mol-ecules are linked by two pairs of inversion-related N-H⋯O and C-H⋯O hydrogen bonds, generating alternating R 2 (2)(8) and R 2 (2)(6) ring motifs, respectively, in a zigzag supra-molecular chain that runs along the c axis. These chains stack along the a axis via S⋯C [3.424 (2) Å] contacts. A three-dimensional supra-molecular network is consolidated by C-H⋯π and π-π inter-actions [inter-centroid distance between di-meth-oxy-benzene rings = 3.815 (1) Å]. The crystal studied was a non-merohedral twin, with a refined value of the minor twin fraction of 0.2477 (6) .
authors.affiliation: Department of Organic Chemistry, University of Madras, Maraimalai Campus, Chennai 600 025, India.
authors.forename: R
authors.initials: R
authors.lastname: Selvakumar
authors.forename: M
authors.initials: M
authors.lastname: Bakthadoss
authors.forename: S
authors.initials: S
authors.lastname: Vijayakumar
authors.forename: S
authors.initials: S
authors.lastname: Murugavel