905983-73-5Relevant articles and documents
A modular approach to achiral and chiral nickel(II), palladium(II), and platinum(II) PCP pincer complexes based on diaminobenzenes
Benito-Garagorri, David,Bocokic, Vladica,Mereiter, Kurt,Kirchner, Karl
, p. 3817 - 3823 (2008/10/09)
The synthesis and characterization of a series of nickel, palladium, and platinum complexes containing new achiral and chiral PCP pincer ligands based on 1,3-diaminobenzene, 5-trifluoromethyl-1,3-diaminobenzene, and 3,5-diamino-4-chloroisobutylbenzoate are reported. The new PCP ligands are prepared conveniently in high yield by treatment of the respective diaminobenzene with 2 equiv of a variety of achiral and chiral R2PCl compounds in the presence of base. PCP complexes of Ni(II), Ni(PCP)Cl, were synthesized by the reaction of NiCl2·6H2O with 1 equiv of a PCP ligand. In similar fashion, treatment of M(COD)X2 (M = Pd, Pt; X = Cl, Br) with 1 equiv of a PCP ligand yields the square-planar complexes M(PCP)X. Palladium PCP complexes featuring a coordinated TFA ligand (TFA = CF3COO-) are obtained by the reaction of Pd(TFA)2 with 1 equiv of a PCP ligand. Alternatively, palladium PCP complexes can also be generated via an oxidative addition route. Addition of 2 equiv of PCP ligands based on 3,5-diamino-4-chloroisobutylbenzoate to Pd 2(dba)3 affords the respective Pd(PCP)Cl pincer complexes in high yields. X-ray structures of representative Ni, Pd, and Pt PCP complexes have been determined. Finally, the use of the palladium complexes as catalysts for the Suzuki-Miyaura coupling of some aryl bromides and phenyl boronic acid has been examined.
