title: A study of the norcaradiene-cycloheptatriene equilibrium in a series of azulenones by NMR spectroscopy; the impact of substitution on the position of equilibrium.
abstract: A systematic investigation of the influence of substitution at positions C-2 and C-3 on the azulenone skeleton, based on NMR characterisation, is discussed with particular focus on the impact of the steric and electronic characteristics of substituents on the position of the norcaradiene-cycloheptatriene (NCD-CHT) equilibrium. Variable temperature (VT) NMR studies, undertaken to enable the resolution of signals for the equilibrating valence tautomers revealed, in addition, interesting shifts in the equilibrium.
authors.affiliation: Department of Chemistry, Analytical and Biological Chemistry Research Facility, University College Cork, Ireland.
authors.forename: Lorraine M
authors.initials: LM
authors.lastname: Bateman
authors.forename: Orla A
authors.initials: OA
authors.lastname: McNamara
authors.forename: N Rachael
authors.initials: NR
authors.lastname: Buckley
authors.forename: Patrick
authors.initials: P
authors.lastname: O'Leary
authors.forename: Francis
authors.initials: F
authors.lastname: Harrington
authors.forename: Norma
authors.initials: N
authors.lastname: Kelly
authors.forename: Sarah
authors.initials: S
authors.lastname: O'Keeffe
authors.forename: Angela
authors.initials: A
authors.lastname: Stack
authors.forename: Shane
authors.initials: S
authors.lastname: O'Neill
authors.forename: Daniel G
authors.initials: DG
authors.lastname: McCarthy
authors.forename: Anita R
authors.initials: AR
authors.lastname: Maguire