Co-ordination and catalytic chemistry of 1,1′-bis(diphenylphosphino)ruthenocene (dppr). Synthesis of [MCl2(dppr)] (M = Ni, Pd or Pt) and molecular structures of dppr and [PtCl2(dppr)]·0.5CH2 Cl2

Studies on Pd/NiFe2O4 catalyzed ligand-free Suzuki reaction in aqueous phase: synthesis of biaryls, terphenyls and polyaryls

“…Polyphenyls are also an important structural element in liquid crystals and fluorescent compounds [48–52]. Terphenyls have been previously synthesized by the reaction of aryl- or benzylzinc reagents with functionalized biphenyl nonaflates [53], Grignard reagents with dihalobenzenes [54–56]: Other methods give poor yields. The Suzuki cross coupling protocol has been used for the synthesis of terphenyls and polyaryls using Pd(OAc) 2 or Pd(PPh 3 ) 4 with or without ligands in homogeneous medium [57–60].…”

Systematic Variation of Bidentate Ligands Used in Aryl Halide Amination. Unexpected Effects of Steric, Electronic, and Geometric Perturbations

“…The xanthene-based ligand gave more amination product than DPPR or the diphenyl ether based-ligand DPPDPE, but this difference is more likely to originate in the preorganized structure of this ligand relative to the flexible DPPDPE. A correlation between ligand bite angles and the amount of reduction product clearly showed that reducing the size of the bite angle led to decreasing amounts of reduction products, particularly for preorganized bidentate ligands such as BINAP and the naphthalene-based ligand DPPN. − …”

Catalytic Phosphite Hydrolysis under Neutral Reaction Conditions

“…Unlike the metal-based phosphate hydrolysis, which is well studied and mainly based on the intermolecular nucleophilic attack of a metal-coordinated hydroxide ion on the phosphate ester, hydrolysis of metal-coordinated phosphites has been much less studied. , To the best of our knowledge, no metal-catalyzed P–O hydrolysis of phosphites under neutral reaction conditions (i.e., the absence of acid and base) was described in the literature. In this context, we found that bis-cationic platinum­(II) complexes of the formulas [Pt­(H 2 O) 2 (dppomf)]­(Otf) 2 ( 2a ; dppomf = 1,1′-bis­(diphenylphosphanyl)­octamethylferrocene) and [Pt­(H 2 O) 2 (dppr)]­(Otf) 2 ( 2b ; dppr = 1,1′-bis­(diphenylphosphanyl)­ruthenocene) are suitable precatalysts for hydrolysis of P­(OR) 3 (R = aromatic and aliphatic substituents) in tetrahydrofuran (THF)/water reaction mixtures at room temperature. Both complexes were straightforwardly obtained upon chloride abstraction of the corresponding chloride precursor 1a / 1b (Scheme ) by Ag­(Otf) (Otf = trifluoromethylsulfonate) in CH 2 Cl 2 at room temperature.…”