Colour and constitution of conjugate bases of benzodifurantrione, its ring-opened derivatives and benzodifuranone dye analogues
作者:Michael G. Hutchings、Anthony J. Lawrence、Alan R. Kennedy
DOI:10.1039/d1ob02442f
日期:——
benzodifuranone dyes. Their deprotonation results in previously unreported near infrared-absorbing conjugate bases. These appear to aggregate in solution, the more so in less polar solvents. Ring-opened derivatives of BDT containing α-dicarbonyl substituents also give coloured conjugate bases, but α-keto-ester and -anilide derivatives differ substantially (ester yellow; anilide intense red). Investigation
作者:Anthony J. Lawrence、Michael G. Hutchings、Alan R. Kennedy、Joseph J. W. McDouall
DOI:10.1021/jo9022155
日期:2010.2.5
The first example of a stable phenylogous enol, resulting from an extended keto−enol tautomerization across a benzene ring, is described. The enol has been isolated, and its structure was proven by X-ray crystallography. The equilibrium between the keto- and enol-tautomers has been extensively studied and quantified in solution by NMR and UV−vis spectroscopy. The position of equilibrium showed a linear