Synthesis of superacidic carbon acid and its derivatives

• (RfSO2)2CH group is strongly acidic CH acid functionality.
• Caron acids bearing (RfSO2)2CH group work as potent acid catalysts.
• Effective synthesis of carbon acids bearing (RfSO2)2CH is summarized.

In this review, we provide an outline of synthetic efforts for carbon acids (CH acids) bearing (RfSO2)2CH group as an acidic functionality. Unlike conventional active methylene compounds such as acetoacetates and malonates are not enough acidic to work as acid catalysts, (RfSO2)2CH-type carbon acids are superacidic in gas phase and catalyze organic reactions in organic solvents.

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