title: Crystal structure of (E)-4-hy-droxy-3-{1-[(4-hy-droxy-phen-yl)imino]-eth-yl}-6-methyl-2H-pyran-2-one.
abstract: In the title Schiff base, C14H13NO4, which adopts the phenol-imine tautomeric form, the dihedral angle between the planes of the benzene and heterocyclic (r.m.s. deviation = 0.037 Å) rings is 53.31 (11)°. An intra-molecular O-H⋯N hydrogen bond closes an S(6) ring. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds to generate C(11) chains propagating in the [010] direction. A weak C-H⋯O link is also observed, leading to the formation of R (5) 5(32) rings extending parallel to the (101) plane.
authors.affiliation: Laboratoire de Physicochimie Analytique et Cristallochimie de Matériaux, Organométalliques et Biomoléculaires, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Amel
authors.initials: A
authors.lastname: Djedouani
authors.affiliation: Laboratoire de Génie Mécanique et Matériaux, Faculté de Technologie, Université 20 Aout 1955, 21000 Skikda, Algeria.
authors.forename: Sihem
authors.initials: S
authors.lastname: Boufas
authors.affiliation: Institut Jean Lamour UMR 7198, Parc de Saurupt, CS 14234 F 54042 Nancy, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Cleymand
authors.affiliation: Institut Jean Lamour UMR 7198, Parc de Saurupt, CS 14234 F 54042 Nancy, France.
authors.forename: Michel
authors.initials: M
authors.lastname: François
authors.affiliation: Institut Jean Lamour UMR 7198, Parc de Saurupt, CS 14234 F 54042 Nancy, France.
authors.forename: Solenne
authors.initials: S
authors.lastname: Fleutot
keywords: crystal structure; hydrogen bonding; hy­droxy Schiff base; phenol–imine tautomer; proton-transfer processes; pyran-2-one