SEARCH Articles Figures Tables Keto and Enol Tautomers Keto tautomer acyclic Keto tautomer proportion Keto tautomers Keto-enol tautomer Keto-phenol tautomers Solvent effects keto-enol tautomer equilibria Tautomer Tautomers Tautomers keto-enol Tautomers keto-enol tautomerism