title: Ethyl 5-hy-droxy-6-oxo-4-phenyl-5,6-dihydro-4H-cyclo-penta-[b]thio-phene-5-carboxyl-ate.
abstract: In the title mol-ecule, C(16)H(14)O(4)S, the dihydro-cyclo-penta-thio-phenone ring system is almost planar, with an r.m.s. deviation of 0.060 Å from the best fit plane through all nine non-H atoms. The cyclo-penta-none ring adopts a severely flattened envelope conformation with the C atom carrying the OH and ethylcarboxylate substituents at the flap. This atom lies only 0.185 (3) Å from the plane through the other four C atoms. The phenyl substituent is inclined at 43.37 (5)° to the dihydro-cyclo-penta-thio-phenone mean plane. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming inversion dimers with R(2) (2)(10) ring motifs. Weak C-H⋯O hydrogen bonds also link mol-ecules into chains along c, while an approximately orthogonal set of C-H⋯O contacts form chains along b, resulting in layers lying parallel to (100). Inversion dimers also form through weaker R(2) (2)(12) C-H⋯S contacts, which combine with C-H⋯O contacts to form stacks along b.
authors: Department of Chemistry, University of Otago, PO Box 56, Dunedin,  New Zealand.
authors: C John
authors: CJ
authors: McAdam
authors: Stephen C
authors: SC
authors: Moratti
authors: Jim
authors: J
authors: Simpson
authors: Zheng
authors: Z
authors: Shi