title: 4-Hydr-oxy-3-[(2E)-3-(3,4,5-trimethoxy-phen-yl)prop-2-eno-yl]-2H-chromen-2-one.
abstract: A new chalcone of the coumarin, C(21)H(18)O(7), containing an annulated α-pyrone ring, was obtained by condensation of the borate complex of ac-yl(hydr-oxy)coumarin with trimethoxy-benzaldehyde. The structure exhibits intra-molecular hydrogen bonding between the hydroxyl oxygen and the ketonic oxygen in the coumarin group. The bicyclic coumarin fragment and the benzene ring form a dihedral angle of 17.1 (4)°. The crystal packing involves dimers inter-connected by C-H⋯O hydrogen bonding.
authors.affiliation: Unité de Chimie des Matériaux, ISSBAT, Université de Tunis-ElManar, 9 Avenue Dr Zoheir SAFI, 1006 Tunis, Tunisia.
authors.forename: Lassaad
authors.initials: L
authors.lastname: Mechi
authors.forename: Samar
authors.initials: S
authors.lastname: Chtiba
authors.forename: Naceur
authors.initials: N
authors.lastname: Hamdi
authors.forename: Rached
authors.initials: R
authors.lastname: Ben Hassen