title: Syntheses and structural studies of Schiff bases involving hydrogen bonds.
abstract: New Schiff bases have been prepared by reacting 3-hydroxy-4-pyridine- carboxaldehyde with various amines. NMR spectroscopic methods provided clear evidence that the Schiff bases exist in the solid state and in solution as hydroxyimino tautomers with the E-configuration. A study of the stabilities of the tautomeric forms and the different conformers has been carried out using density functional calculations at the B3LYP/6-31G** level.
authors.affiliation: Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Senda del Rey 9, E-28040 Madrid, Spain. aperona@bec.uned.es
authors.forename: Almudena
authors.initials: A
authors.lastname: Perona
authors.forename: Dionisia
authors.initials: D
authors.lastname: Sanz
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Claramunt
authors.forename: José
authors.initials: J
authors.lastname: Elguero
mesh_terms: D006860:Hydrogen Bonding; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D012545:Schiff Bases