Reaction of co-ordinated phosphines: arylation of olefins by palladium(II) acetate and triarylphosphine

Abstract

SummavjJ Olefins are arylated by Pd(OAc), a phenylpalladium complex is presumed intermediate.

Reversible oxidative addition of triphenylphosphine to zero-valent nickel and palladium complexes

“…The ethyl cinnamate formation is inhibited by excess PPh3. 5 Related behavior appeared in some reactions with nickel complexes. After 2 h at 200°, the reaction of 2-chlorophenyl acrylate with a Ni(CO)2(PPh3)2 catalyst yielded not only the normal products coumarin, 3,4-dihydrocoumarin, and 3methyl-2(3Ff)-benzofuranone, but also small amounts of 2chlorophenyl benzoate and phenyl benzoate (eq 3).…”

Palladium catalyzed reductive homocoupling reactions of aromatic halides in dimethyl sulfoxide (DMSO) solution

“…A wide variety of reducing reagents have been used to regenerate in situ the Pd 0 active species, including hydroquinone [8], formate salt [14], hydrogen gas [15], amines [9,16], alcohols [17], zinc [18], indium [19], triphenylarsine [20], etc.…”

Palladium-Catalyzed Reductive Homocoupling of Aromatic Halides and Oxidation of Alcohols

“…The active Pd 0 species is usually needed to be in situ regenerated because it is prone to agglomerate to form black sediment and lose the catalytic activity. Various auxiliary reducing reagents including hydroquinone, formate salt, amines, zinc, indium, and triphenylarsine have been used for the palladium-catalyzed reductive homocoupling reactions. The major drawback of these methods is the necessity for the subsequent separation of the excess reducing reagents as well as their oxidized products.…”