Suzuki-Miyaura Cross-Coupling Reaction Based on Novel Palladium(II) Diphenylphosphine Derivative Catalyst

The synthesis and characterization of palladium complexes ((CH3)3SiC6H4PPh2)2PdCl2,4a, and ((CH3)3SiC12H8PPh2)2PdCl2, 4b, containing phosphine (CH3)3SiC6H4PPh2, 3a and (CH3)3SiC12H8PPh2,  3b ligands are reported. The phosphine ligands are prepared conveniently in high yield by treatment of the corresponding 1,4-dibromoarene  with one equivalent of butyl lithium, and one equivalent of ClPPh2 at -78 °C under an atmosphere of argon. The palladium complexes are synthesized by the reaction of Pd(cod)Cl2 with two equivalent of the above mentioned phosphine ligands. The new complexes were fully characterized by spectroscopic methods  and elemental analysis. Furthermore, the use of the palladium (II) complexes of such system as pre-catalysts for the Suzuki-Miyaura coupling of some arylbromides and arylchloride with substituted  phenyl boronic acid has been tested. Keywords:1,4-dibromoarene, Palladium complex, Suzuki coupling, catalyst

The need for a revised lower limit for the 4253H, Twice nonparametric smoother

Velleman and Hoaglin (1981) describe the nonparametric smoother 4253H,Twice which uses a combination of running medians and Hanning to smooth data sequences. Velleman and Hoaglin (1981) suggest that the minimum sample size recommended for this nonparametric smoother is seven. A proof and working example presented here suggest that the recommended minimum data points should be higher than seven.Nonparametric smoothing 4253H,Twice smoother

Nanopackaging: nanotechnologies and electronics packaging

This book presents a comprehensive overview of nanoscale electronics and systems packaging, covering nanoscale structures, nanoelectronics packaging, nanowire applications in packaging, and offers a roadmap for future trends. It is intended for industrial and academic researchers, and industrial electronics packaging engineers