Influence of substituent on UV absorption and keto–enol tautomerism equilibrium of dibenzoylmethane derivatives
作者:Jan Zawadiak、Marek Mrzyczek
DOI:10.1016/j.saa.2012.07.109
日期:2012.10
and nitro substituents in aromatic rings were collected. General influence of substituent on absorption maxima and absorption intensity was defined. Hyperchromic effects were observed for diketones with electron-donating groups in para postion. The keto-enol tautomerism equilibrium constant of obtained compounds was investigated with (1)H NMR spectroscopy. Significant changes of equilibrium were observed
Determination of the enol form of asymmetric 1,3-dicarbonyl compounds: 2D HMBC NMR data and DFT calculations
作者:Meltem Tan、İshak Bildirici、Nurettin Mengeş
DOI:10.2298/jsc010318053t
日期:——
In this study, a series of asymmetric aryl 1,3-dicarbonyl compounds were synthesized and their enolforms were observed via experimental data and theoretical calculations. According to the 1H- and 13C-NMR results, all the investigated compounds were found as a single enolform in CDCl3 solution. Moreover, their HMBC spectra were applied to identify the observed enolforms and correlations between certain