title: A catalytic and mechanistic investigation of a PCP pincer palladium complex in the Stille reaction.
abstract: In an improved procedure, the complex {2,6-bis[(diphenylphosphino)methyl]benzene}chloropalladium(II) (1) was synthesised as its THF adduct and the structure was determined by X-ray crystallography. The catalytic properties of the derivative {2,6-bis[(diphenylphosphino)methyl]benzene}(trifluoroacetato)palladium(II) (2) was investigated in the Stille reaction. Complex 2 proves to be an excellent catalyst for the C-C cross-coupling between trimethyl phenyl stannane and aryl bromides using a very low catalyst loading (0.1-0.0001%), giving high turnover numbers (TONs) up to 6.9 x 10(5). A kinetic investigation of the catalytic reaction suggests a heterogeneous colloidal palladium catalyst formed from the PCP Pd(II) pre-catalyst.
authors.affiliation: Inorganic Chemistry, Department of Chemistry, Lund University, P. O. Box 124, S-221 00 Lund, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Olsson
authors.forename: Patrik
authors.initials: P
authors.lastname: Nilsson
authors.forename: Mostafa
authors.initials: M
authors.lastname: El Masnaouy
authors.forename: Ola F
authors.initials: OF
authors.lastname: Wendt