Reaction of nickel(II) and palladium(II) with tetraphenyldiphosphine

Chemoselectivity control in the reaction of a dinuclear chloro-bridged cyclopalladated complex with potassium diphenylphosphide

“…It was also reported that Pd(PhCN) 2 Cl 2 reacted with Ph 2 PPPh 2 to yield a complex of the formula Pd(P 2 Ph 4 )Cl 2 [42]. The composition of this complex was supported by elemental analysis [42]. The 31 P NMR spectrum of this complex in CDCl 3 contained a singlet at 76.4 ppm [42].…”

“…In these reactions, the formation of PdL 2 (PPh 2 ) 2 species was proposed. It was also reported that Pd(PhCN) 2 Cl 2 reacted with Ph 2 PPPh 2 to yield a complex of the formula Pd(P 2 Ph 4 )Cl 2 [42]. The composition of this complex was supported by elemental analysis [42].…”

“…The composition of this complex was supported by elemental analysis [42]. The 31 P NMR spectrum of this complex in CDCl 3 contained a singlet at 76.4 ppm [42]. On the other hand, in the Pd(0)-catalyzed allylic phosphination reactions of HPPh 2 , Ph 2 PPPh 2 was isolated in 1e40% yield depending on the reaction conditions [43].…”

2-Pyridyl-phosphine and -diphosphine complexes of nickel(0), their reactivity (including aqueous solution chemistry), and some related, incidental methylphosphonium iodides

“…Such chemistry is well documented for oxidation of a phosphine to its monooxide, definitively by use of 17 reduced. Examples of such redox chemistry have been found in Ni II chemistry [28], as well as in Pd II and Pt II systems [29]. Of interest, we reported recently that NiX 2 (P-P) species, where X is a halide and P-P is d(py)pcp or d(py)pe, undergo slow decomposition (over 24 h at r.t.) in water to give [Ni(H 2 O) 6 ]Cl 2 and the diphosphine dioxide with no change in pH, and the reaction was attributed to trace O 2 [1].…”

Übergangsmetallorganische Reaktionskaskaden zum Aufbau höher aggregierter Systeme: Nickelacyclische Carboxylate als Precursoren für die Synthese eines Oxinato‐Nickel(II)‐Tetramers

“…Schema 4 verdeutlicht, wie die Komplexe 6 -9 entstehen könnten: Schlüsselprodukt ist die durch oxidative Addition am Nickel(0) entstehende Oxinato-phosphido-Spezies, die in einer thermischen Reaktion intermediär Bis(oxinato)-Nickel(II) und Tetraphenyldiphosphin bildet. Es ist bekannt, dass sich aus Tetraphenyldiphosphin in Anwesenheit von Nickel(II)-Verbindungen Ph 2 PH bilden kann [9]. Die Wasserstoffquelle in dieser Reaktion ist allerdings noch nicht zweifelsfrei geklärt, neben Tetraphenyldiphosphin selbst kommt zum Beispiel auch THF in Frage.…”