Orthometallated palladium trimers in C–C coupling reactions

Chemicals from Alkynes with Palladium Catalysts

“…In addition, aqueous solvents at 40 °C have been employed in the alkynylation of aryl iodides using as catalyst (0.25 mol %) the palladacycle 202 . Other recent examples involve the use of an ortho -palladated complex of homoveratrylamine using aryl iodides and bromides or recyclable palladacycle systems using ionic liquids as solvents, although working only with aryl iodides as coupling partners . In addition, recent examples of coupling of aryl iodides and bromides with terminal alkynes using polystyrene-anchored Schiff-based palladacycles as catalysts can be found .…”

A macrocyclic Pd(II)–Ni(II) complex in Heck and Suzuki reactions

“…Different classes of palladium species have been tested in the Heck and the Suzuki cross-coupling reactions, such as palladacycles [12][13][14][15][16][17] and complexes with N-heterocyclic carbenes [18][19][20][21][22][23]. Good results have also been obtained for immobilized palladium catalysts [24][25][26][27] as well as for Pd(0) nanoparticles [28][29][30].…”

A Pd Halide Cluster from 1964: Pd6Cl8 Capped by Ring-Opened C3Ph3 Ligands from Oxidative Addition of Cyclopropenium Ions

“…In 1964 Moiseev, Vargaftik, and Syrkin reported a reaction of K 2 PdCl 4 with triphenylcyclopropenium chloride in the presence of ethylene and proposed a product with two cyclopropenyl ligands capping a [PdCl 2 PdCl 2 Pd] 2+ core ( 1 ; see Scheme , bottom right) . Such fragments from α-palladium chloride chains are uncommon in coordination chemistry, but a few examples have been characterized so far . However, some other studies of cyclopropenium ion reactions with transition metals reported a ring opening leading to four-membered metallacycles. − Therefore, we became interested in the actual structure of this reaction product and the associated cyclopropenium reactivity.…”