title: Crystal structure of 1-(8-meth-oxy-2H-chromen-3-yl)ethanone.
abstract: In the structure of the title compound, C12H12O3, the di-hydro-pyran ring is fused with the benzene ring. The di-hydro-pyran ring is in a half-chair conformation, with the ring O and methyl-ene C atoms positioned 1.367 (3) and 1.504 (4) Å, respectively, on either side of the mean plane formed by the other four atoms. The meth-oxy group is coplanar with the benzene ring to which it is connected [Cb-Cb-Om-Cm torsion angle = -0.2 (4)°; b = benzene and m = meth-oxy], and similarly the aldehyde is coplanar with respect to the double bond of the di-hydro-pyran ring [Cdh-Cdh-Ca-Oa = -178.1 (3)°; dh = di-hydro-pyran and a = aldehyde]. In the crystal, mol-ecules are linked by weak meth-yl-meth-oxy C-H⋯O hydrogen bonds into supra-molecular chains along the a-axis direction.
authors.affiliation: Department of Applied Chemistry, Dongduk Women's University, 23-1 Wolkok-dong, Sungbuk-ku, Seoul, 136-714, Republic of Korea.
authors.forename: Dongsoo
authors.initials: D
authors.lastname: Koh
keywords: chromenes; crystal structure; di­hydro­pyran ring; hydrogen bonding