Ammonium hexachloropalladate(IV) powder, is an orange crystalline powder that contains palladium in the +4 oxidation state. This is also known as ammonium tetrachloropalladate(II) or ammonium palladium chloride, is a chemical compound with the formula (NH4)2PdCl6. It is a versatile reagent that can facilitate a range of transformations, including coupling reactions, hydrogenation, oxidation, and cross-coupling reactions such as the Heck reaction and Suzuki-Miyaura coupling. Ammonium hexachloropalladate(IV) is commonly used as a precursor in various palladium-catalyzed reactions, particularly in organic synthesis.