title: 5-Chloro-6-hy-droxy-7,8-dimethyl-chroman-2-one.
abstract: In the title mol-ecule, C(11)H(11)ClO(3), the fused pyran ring adopts a half-chair conformation. In the crystal, inter-molecular O-H⋯O hydrogen bonds link mol-ecules into chains along [100]. These chains are inter-connected by weak inter-molecular C-H⋯O contacts which generate R(2) (2)(8) ring motifs, forming sheets parallel to (001). Tetra-gonal symmetry generates an equivalent motif along b. Furthermore, the sheets are linked along the c axis by offset π-π stacking inter-actions involving the benzene rings of adjacent mol-ecules [with centroid-centroid distances of 3.839 (2) Å], together with an additional weak C-H⋯O hydrogen bond, resulting in an overall three-dimensional network.
authors.affiliation: Department of Chemistry, University of Otago, PO Box 56, Dunedin,  New Zealand.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Cameron
authors.forename: Shailesh K
authors.initials: SK
authors.lastname: Goswami
authors.forename: Lyall R
authors.initials: LR
authors.lastname: Hanton
authors.forename: C John
authors.initials: CJ
authors.lastname: McAdam
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Moratti
authors.forename: Jim
authors.initials: J
authors.lastname: Simpson
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