title: Crystal structure of 3-(4-meth-oxy-phen-yl)-2,3-di-hydro-1H-naphtho-[2,1-b]pyran-1-one.
abstract: In the title compound, C20H16O3, the hydro-pyran ring adopts a distorted half-chair conformation with the methine C atom and the ring O atom displaced by -0.554 (2) and 0.158 (1) Å, respectively, from the plane of the other four atoms (r.m.s. deviation = 0.020 Å). Its mean plane (all atoms) is inclined to the naphthalene ring system at a dihedral angle of 11.67 (1)°. The dihedral angle between the napthalene ring system and the phenyl ring is 71.84 (1)°. In the crystal, no diectional inter-actions beyond van der Waals contacts could be identified.
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Vasanthi
authors.affiliation: Department of Chemistry, Madras Christian College, Chennai-59, India.
authors.forename: D
authors.initials: D
authors.lastname: Reuben Jonathan
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Elizhlarasi
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: B K
authors.initials: BK
authors.lastname: Revathi
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: G
authors.initials: G
authors.lastname: Usha
keywords: crystal structure; flavone derivative; hydro­pyran