What is Tetrakis(triphenylphosphine)palladium(0)?

Tetrakis(triphenylphosphine)palladium(0)
Synonyms Palladium(0)tetrakis(triphenylphosphine)
Molecular Formula C72H60P4Pd
Molecular Weight 1155.58
CAS Registry Number 14221-01-3
Melting point 103-107 ºC
Water solubility insoluble
Tetrakis(triphenylphosphine)palladium(0) is the chemical compound Pd[P(C6H5)3]4, often abbreviated Pd(PPh3)4, or even PdP4. It is a bright yellow crystalline solid that becomes brown upon decomposition in air.
Palladium is a chemical element with the chemical symbol Pd and an atomic number of 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.
Application
Catalyst for Negishi coupling, Suzuki coupling, Stille coupling, and Sonogashira coupling reaction
Catalyst for Buchwald-Hartwig amination reaction
Catalyst for the carbonylation of vinyl iodides
Catalyst for reduction reaction of aryl bromides
Catalyst for carbon-tin bond formation
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Applications of Tetrakis(triphenylphosphine)palladium(0)

Tetrakis(triphenylphosphine)palladium(0) is the chemical compound Pd[P(C6H5)3]4, often abbreviated Pd(PPh3)4, or even PdP4. It is a bright yellow crystalline solid that becomes brown upon decomposition in air.
Properties
The four P atoms are at the corners of a tetrahedron surrounding the palladium(0) center. This anatomy is archetypal for four-coordinate 18e complexes. The agnate complexes Ni(PPh3)4 and Pt(PPh3)4 are aswell able-bodied known. Such complexes reversibly abstract PPh3 ligands in solution, absolution the 16e M(PPh3)3. Thus, reactions attributed to Pd(PPh3)4 in actuality appear from Pd(PPh3)3 or even Pd(PPh3)2.
Applications
Tetrakis(triphenylphosphine)palladium(0) is broadly acclimated as a agitator for palladium-catalyzed coupling reactions. Prominent applications cover the Heck reaction, Suzuki coupling, Stille coupling, Sonogashira coupling, and Negishi coupling. These processes activate with two alternating ligand dissociations followed by the oxidative accession of an aryl halide to the Pd(0) center:Pd(PPh3)4 + ArBr → PdBr(Ar)(PPh3)2 + 2 PPh3
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