Four‐Electron Oxidative Formation of Aryl Diazenes Using a Tantalum Redox‐Active Ligand Complex

The active ingredient: The bis(μ-imido) tantalum dimer {[ONOred]Ta(μ-N-p-tolyl)(py)}2 releases the aryl diazene (p-tolyl)NN(p-tolyl) upon four-electron oxidation with PhICl2 (see scheme; py=pyridine). Studies suggest that the redox-active [ONOred]3− ligands act to collect single-electron oxidation equivalents for the multielectron reaction.