SEARCH Articles Figures Tables Acidity of carbon acids Acidity of carbonic acid Carbonic acid derivates Carbonic acid derivatives Carbonic acid derivs Functional derivatives of carbonic acid Interconversions of Carbonic Acid Derivatives via Heterocumulenes as Intermediates Preparation of Heterocumulenes from Carbonic Acid (Derivatives) Reactions at the Carbonyl Carbon of Acid Derivatives Summary of Carbonic-Acid-Derivative Chemistry Transformation of Heterocumulenes and Heteroatom Nucleophiles into Carbonic Acid Derivatives