Ruthenium-catalyzed umpolung carboxylation of hydrazones with CO2† †Electronic supplementary information (ESI) available: Experimental details and characterization data. See DOI: 10.1039/c8sc01299g.

Ruthenium-catalyzed umpolung carboxylation of hydrazones with CO2† †Electronic supplementary information (ESI) available: Experimental details and characterization data. See DOI: 10.1039/c8sc01299g.