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
Regio- and Enantioselective Asymmetric Transfer Hydrogenation of One Carbonyl Group in a Diketone through Steric Hindrance
作者:Noha Khamis、Ye Zheng、Marianna N. Diamantakis、Guy J. Clarkson、Jie Liu、Martin Wills
DOI:10.1021/acs.joc.3c01950
日期:2024.2.16
On the basis of steric hindrance, one carbonyl group in a diketone can be reduced in a regioselective manner, with high enantioselectivity. The methodology can be extended to ketones with varied length of hydrocarbon chain spacing, and the products can be converted by oxidation to hydroxy esters or lactones without loss of enantiopurity.