Phenylboronic Acid In Presence Research Articles

Green synthesis of Palladium magnetic nanoparticles decorated on carbon nanospheres using Chenopodium and their application as heterogenous catalyst in the Suzuki-Miyaura coupling reaction

Synthesis of palladium magnetic nanoparticles decorated on carbon nanosphere was carried out by green method. The phytochemicals like polyphenols, saponins, steroids and flavonoids present in the shoot extract of Chenopodium album Linn., ease the reduction of Pd+2 to Pd0. The synthesized green catalyst was characterized by field emission scanning electron microscopy (FESEM) which inferred the presence of 70–90 nm sphere shaped particles distributed evenly on the carbon surface. The catalyst Pd/Fe3O4 was further characterized by XRD and FTIR. The synthesized catalyst was used in Suzuki Miyaura coupling reaction with aryl halides and methoxy phenylboronic acid in presence of potassium phosphate and 1,4-dioxane at 90 °C. The CC coupled products were characterized by 1H NMR. The catalyst was recycled and used in cross coupling reaction to check the efficiency. The results indicate that the catalyst was active up to two cycles and after that it loses efficiency.

Design and syntheses of a new family of palladium complexes derived from tridentate ligands and their application as catalysts for Suzuki-Miyaura cross-coupling reactions

Palladium complexes [Pd(L1−5)(PPh3)]ClO4 (LnH (n = 1–5, H = phenolic dissociable proton) (1–5)) were synthesised and characterised by different spectroscopic methods like 1H NMR, IR and UV-visible spectral studies. The molecular structure of the representative complex [Pd(L2)(PPh3)]ClO4 (2) was determined by X-ray crystallography. These new complexes were utilised to study Suzuki-Miyaura cross-coupling reactions. Substituted aryl halides were reacted with the phenylboronic acid in presence of these palladium-based catalysts and sodium hydroxide. Biphenyl and its derivatives were synthesised via. C-C bond formation. The plausible mechanism of these cross-coupling reactions was proposed on the basis of theoretical calculation utilising density functional theory (DFT).