Catalytic Oxidation of Hydrazo Derivatives Promoted by a TiCl3/HBr System.

The article discusses a study on the catalytic oxidation of hydrazo compounds boosted by a catalyst mixture comprising titanium trichloride (TiCl3) and hydrogen bromide (HBr). TiCl3/HBr system works via two separate catalytic cycles that are connected by radical species. It is found that preparing azo compounds through catalytic oxidation of corresponding hydrazo precursors were highly efficient and corresponds a valuable addition to the chemistry of azo compounds.