title: Dynamic NMR study of cyclic derivatives of pyridoxine.
abstract: A series of pyridoxine derivatives was investigated by (1) H and 2D nuclear overhauser enhancement spectroscopy (NOESY) NMR. The free energies of activation for the pyridyl-oxygen rotation of the 2,4-dinitrophenyl ether of the seven-membered acetals of pyridoxine were measured by dynamic NMR. A conformational exchange between the chair and twist forms of the seven-membered acetal ring was confirmed by dynamic NMR and STO3G computations.
authors.affiliation: Kazan (Volga Region) Federal University, 18 Kremlevskaya St., 420008, Kazan, Russian Federation.
authors.forename: I Z
authors.initials: IZ
authors.lastname: Rakhmatullin
authors.forename: L F
authors.initials: LF
authors.lastname: Galiullina
authors.forename: M R
authors.initials: MR
authors.lastname: Garipov
authors.forename: A D
authors.initials: AD
authors.lastname: Strel'nik
authors.forename: Y G
authors.initials: YG
authors.lastname: Shtyrlin
authors.forename: V V
authors.initials: VV
authors.lastname: Klochkov
keywords: dynamic 1H NMR; energy barrier; pyridoxine