Isomerism and tautomerism of 5-fluoroalkyl-substituted 3-acetyldihydrofuran-2(3H)-ones
作者:M. I. Kodess、E. G. Matochkina、D. N. Bazhin、T. I. Gorbunova、A. Ya. Zapevalov
DOI:10.1134/s1070363209040215
日期:2009.4
The geometric isomerism and tautomeric equilibrium of 5-fluoroalkyl-3-acetyldihydrofuran-2(3H)-ones obtained by condensation of (perfluoroalkyl)methyloxiranes with acetoacetic ester were studied. In the solid state the acyl-gamma-lactones are in diketo form, mainly as cis isomer, whose structure is confirmed by the data of X-ray structural investigation, while in solution an equilibrium exists of cis-trans isomers and an enol form, as established by 1D and 2D methods of H-1, C-13, and F-19 NMR spectroscopy.