Patent ID: 8772520

Claim:
A process for the preparation of a Pd(0)L n complex, where L is a ligand and n is 2, comprising the steps of: a. reacting a Pd(II) complex in at least one solvent with a base and a ligand L; and b. if required, adding further base, optionally in at least one solvent, to form the Pd(0)L n complex; wherein the at least one solvents in steps a and b are independently the same or different; and wherein the Pd(II) complex is selected from the group consisting of Pd(olefin) x (Hal) 2 , Pd(Hal) 2 and M 2 Pd(Hal) 4 , in which each Hal is independently a halide, M is a cation, x is 1 or 2, and wherein when x=1 the olefin is a diolefin and when x=2 the olefin is a mono-olefin.