Stereoelectronic structure of α-bromoalkenyl trifluoromethyl ketones
作者:N. N. Chipanina、T. N. Aksamentova、A. Yu. Rulev
DOI:10.1134/s1070428009100017
日期:2009.10
The results of quantum-chemical calculations at the B3LYP/6-311G** level of theory showed that (Z)-alpha-bromo-beta-arylalkenyl trifluoromethyl ketones are more stable than the corresponding E isomers by 4-5 kcal/mol. Relatively large positive charge on the olefinic beta-carbon atom and strong polarization of the C=C bond in both Z-s-cis and Z-s-trans conformers makes bromoalkenyl trifluoromethyl ketones the most potent Michael acceptors among alpha,beta-unsaturated carbonyl compounds. The calculated data are very consistent with the experimental IR spectra.