letter The [RPPh3] 2 [Pd2X6] as a Catalyst Precursor for the Heck Cross-Coupling Reaction by in situ Formation of Stabilized Pd (0) Nanoparticles

Abdol Reza Hajipour, Ghobad Azizib

2013

Synlett

24

0254-0258

Abstract: Pd (II) anionic, square planar complexes of the type [RPPh3] 2 [Pd2X2Cl4], where 
X= Cl, Br, have been applied for the first time as a catalyst precursor for the Heck reaction 
carried out in DMF at 140 C. The highest yield was obtained for the most reducible 
ones,[MePPh3] 2 [Pd2Br2Cl4], in DMF in the presence of NaHCO3 as a base. It was found 
that during the reaction, phosphonium halide stabilized Pd (0) nanoparticles of about 10 nm, 
which have been formed in situ from the palladium (II) precursor and Pd (0) colloidal ...