Synthesis and Electrochemical Properties of 3-(3,6-Dioxo-1,4-cyclohexadienyl)methyl-<i>p</i>-tropoquinone. Analysis of a Four-Electron Redox System by Cyclic Voltammetry
作者:Akira Mori、Yasutomo Goto、Hitoshi Takeshita
DOI:10.1246/bcsj.60.2497
日期:1987.7
was prepared from 2,5-bis(arylmethoxy)tropone by consecutive reaction, a homolytic rearrangement, subsequent debenzylation, and a DDQ–dehydrogenation. According to cyclic voltammetry, this four-electron redox system was operative, in sharp contrast to the case of the benzenoid bisquinones, via four successive one-electron transfer processes. Two other tropolone derivatives carrying p-benzoquinone segment
The Kinetic Evidence of the Concerted [1,9] Sigmatropy for the Acetyl Migration in the 2-Acetoxytropones. The NMR Spectral Analysis of the Seven-Fold Degenerated Acetotropy of Hexaacetoxytropone
“The acetotropy” of 2-acetoxytropones was shown to be a concerted [1,9] sigmatropic process on the basis of a kinetic analysis. A little substituent effect for the activation free energy of the acetyl migration was recognized. Preferred tautomers of polyacetoxytropones were those having the carbonyl group at inner positions. As an extreme case, a “Merry-Go-Round”-type rearrangement was operative in hexaacetoxytropone.
[EN] TROPOLONE DERIVATIVES AND TAUTOMERS THEREOF FOR IRON REGULATION IN ANIMALS<br/>[FR] DÉRIVÉS DE TROPOLONE ET LEURS TAUTOMÈRES POUR LA RÉGULATION DU FER CHEZ LES ANIMAUX