We discuss the environmental and energetic benefits of coupling nitrogenous waste treatment with the electrochemical conversion of CO₂ to value-added products via direct reduction or electrocarboxylation. In particular, we demonstrate that co-electrolysis of urea or ammonia with CO₂ requires significantly lower cell voltages than CO₂ electrolyzers relying on the oxygen evolution reaction as an anodic process.

The interaction of 5,5-dialkyl(diaryl)-substituted 4-diazo-3(2H)furanones with Brønsted acids (TFA, TsOH, etc.) causes elimination of nitrogen accompanied by 1,2-nucleophilic rearrangement, giving rise to exclusive formation of 4,5-dialkyl(diaryl)-substituted 3(2Н)-furanones, ring-fused 3(2H)-furanones, and phenanthro[9,10-b]furan-3(2H)-ones in yields of up to 99%. The reaction is a new highly efficient way for the synthesis of multisubstituted 3(2Н)furanones.

Ni(OH)₂-catalyzed electrochemical oxidation of ammonia can be used for the synthesis S- or P-containing NH₄NO₃-based fertilizers with up to 72% faradaic efficiency and up to 98% ammonia removal efficiency.