Pd/NHCs‐Catalyzed Denitrative/Dechlorinated N‐Arylation of Nitroarenes/Chloroarenes to Hydrazine Derivatives

Palladium‐catalyzed denitrative/dechlorinated C‐N coupling reactions of nitroaromatics/chloroarenes with hydrazines/hydrazones were performed using sterically bulky N‐heterocyclic ligands (NHC = 2‐aryl‐5‐(2,4,6‐triisopropylphenyl)‐2,3‐imidazolylidene[1,5‐a]pyridines). A range of N‐arylbenzophenone hydrazones/hydrazine derivatives were obtained in good to excellent yields. This protocol provides an efficient method for the preparation of hydrazones/hydrazines via C‐N coupling of inexpensive nitroarenes and chloroarenes.