Yellow crystal, soluble in benzene and toluene, insoluble in ether and alcohol, sensitive to air, stored in cold storage away from light. Tetrakis (triphenylphosphine) palladium, as an important transition metal catalyst, can be used to catalyze coupling, oxidation, reduction, elimination, rearrangement, isomerization and other reactions. Its catalytic efficiency is very high, and it can catalyze many reactions which are difficult to occur under the action of similar catalysts..