Base- and ligand-free heterogeneously catalyzed homocoupling of arylboronic acids

Active Palladium Colloids via Palladacycle Degradation as Efficient Catalysts for Oxidative Homocoupling and Cross-Coupling of Aryl Boronic Acids

“…24,25 Although, this transformation has been carried out using different metals, palladium-catalyzed oxidative homocoupling is at the forefront. 26,27 Recent advancements have also highlighted the possibility of performing the catalytic transformation under base- and ligand-free conditions. 28 However, most of these reports have been found to employ homogeneous catalysts that are difficult to recover, and the catalyst loadings have also been high.…”

Palladium‐Catalyzed Aerobic Oxidative Carbonylation of Arylboronate Esters under Mild Conditions

“…Another interesting finding is that there was almost no biaryl product formed in this oxidative carbonylation. However, arylboronic acid derivatives could be homocoupled in the presence of oxygen 37–39. The difference between the oxidative homocoupling and this oxidative carbonylation was mainly attributed to the presence or absence of CO.…”

Highly Enantioselective Copper(I)‐Catalyzed Conjugate Addition of Terminal Alkynes to 1,1‐Difluoro‐1‐(phenylsulfonyl)‐3‐en‐2‐ones: New Ester/Amide Surrogates in Asymmetric Catalysis

“…Heterogeneous ligandless Pd 0 that is supported on carbon (Pd/C)28a is also an effective catalyst for oxidative homocoupling reactions under aerobic conditions (Scheme ) 28b. Recently, nanosized palladium was stabilized primarily within a cage of Te‐Dps, a highly thermostable protein from the starved cells of the thermophilic bacterium Thermosynechoccus elongates , and then used in the homocoupling reaction of arylboronic acids under aerobic conditions 28c.…”