Keto-Enol Intermediates in Sugar Interconversion and Epimerization. In sugars, the linear and cyclic hemiketal or hemiacetal of the sugar exist in equilibrium; in the linear form, sugars can ...

Alternatively, an NHC–enol equivalent VI undergoes a subsequent addition/N-acylation process to furnish the final [3+2] annulation product 4a (right cycle). Full size image Conclusions ...

Metal acetylacetone (2,4-pentanedione) is a beta-diketone that occurs in the form of enol and tautomeric keto mixture. In basic solution, this organic compound is deprotonated to form the acac or ...