Catalytic Cyclization and Dimerization of 1.5-Hexadiene by Transition Metals: The Reactivity of NiII and PdII Complexes containing Bi- or Tridendate Ligands and of Bis(alkyne)nickel(0) Compounds

Synthesis, Characterization, and Reactivity of Cationic Palladium(II) and Platinum(II) Iodo Complexes Containing a Linear or a Tripodal Aminophosphine. The X-Ray Crystal Structures of [Pd{HN(CH2CH2PPh2)2}I]I and [Pd3{N(CH2CH2PPh2}3)2I4]I2Dedicated to Professor Joachim Strähle on the Occasion of his 65th Birthday

“…The singlets at δ 37.9 for 1 and δ 3.5 and 36.0 (integration ratio 1:2) for 3 in their 31 (4)]. These data suggest for 2 and 4 a square-planar arrangement to the metal in solution similar to 1 and 3, respectively although on the basis of the broadening of the signals in 4, the participation in some extent of the N atom in the coordination to platinum should not be excluded.…”

“…Likewise from the reaction (2 ϩ 3AcCysSH) in the presence of 6 eq. The structural arrangement for 1 · H 2 O is the same as that found for [Ni(PNHP)Cl]Cl [4] and analogous to [Pt(triphos)X]X (X ϭ Cl, Br, I) [21]. However, complex 4 interacts with these thiols in (DMSOd 6 /D 2 O) ( Table 1), undergoing a chelate ring-opening with spontaneous oxidation of one P atom of NP 3 , to give compounds 4a (AcCysSH) and 4b (GSH) (Scheme 2).…”

“…There are only a few X-ray crystal structures reported in the literature corresponding to palladium(II) and platinum(II) complexes of the aminophosphine bis [2-(diphenylphosphino)ethyl]amine (PNHP) [4,6] and its NH substituted derivative, tris [2-(diphenylphosphino)ethyl]amine (NP 3 ) [7Ϫ9]. On the other hand, the structural studies in solution for halo complexes are very limited [10].…”

Stereospecific polymerization of 1,3-butadiene catalyzed by cobalt complexes bearing N-containing diphosphine PNP ligands

“…Although it was not successful to grow crystals suitable for a crystallographic analysis, we assigned 1b to be a tetrahedral geometry with the cobalt center coordinated by two chlorides and the two phosphorus atoms from the ligand, as reported in the literature [34]. This ligand was usually used to form chromium complexes as the efficient catalyst precursors for the selective trimerization of ethylene [35e37] and its nickel and palladium complexes have been also reported [33,38,39]. Since the complexes 1a and 1b have low solubility in ethanol, the products directly precipitated from the reaction solutions, which made for convenient separation and good yields.…”

Tris(2,2′-bioxazoline-κ2N,N′)copper(II) diperchlorate and tris(2,2′-bioxazoline-κ2N,N′)nickel(II) diperchlorate

“…2,2 H -Bithiazoline has been used for assembling coordination compounds showing interesting magnetic properties (Liu et al, 2003). As the analogue of 2,2 H -bithiazoline, 2,2 H -bioxazoline is also a good ligand, used for fabricating novel topologies (Patra et al, 2001;Walther et al, 1999;Ozarowski et al, 1988). It may act as a bidentate terminal ligand or as a bridging ligand (Haddleton et al, 1998;Patra et al, 2003).…”