Enol Forms of 1,3-Indanedione, Their Stabilization by Strong Hydrogen Bonding, and Zwitterion-Assisted Interconversion
作者:Mark Sigalov、N. Gabriel Lemcoff、Bagrat Shainyan、Nina Chipanina、Tamara Aksamentova
DOI:10.1002/ejoc.201000026
日期:2010.5
By analyzing NMRspectroscopic data, and supported by IR, UV/Vis, Raman, dielectrometry, and DFT techniques, a comprehensive study of the 1:2 adducts of picolinaldehyde and 1,3-indanediones is presented. The parent indanedione derivative 5 exists in an equilibrium between all-keto and enol forms, the latter being stabilized by an intramolecularO–H···N hydrogen bond. Only the all-keto form was observed