14267-08-4Relevant articles and documents
Shoukry, M.,Hohmann, H.,Eldik, R. van
, p. 187 - 192 (1992)
Combining the reactivity properties of pcy3 and P t Bu3 into a single ligand, P(i Pr)(t Bu)2. reaction via mono- or bisphosphine palladium(0) centers and palladium(i) dimer formation
Proutiere, Fabien,Lyngvi, Eirik,Aufiero, Marialuisa,Sanhueza, Italo A.,Schoenebeck, Franziska
, p. 6879 - 6884 (2014)
Trialkylphosphine ligands are ubiquitous in catalysis. Via modulation of the steric bulk of these ligands, two central aspects that dictate reactivity and selectivity in catalysis can be controlled: i.e., the coordination sphere and favored oxidation stat
Preparation of (Chloromethyl)palladium(II) Derivatives from Complexes of Palladium Dichloride by Reaction with Diazomethane or Bis(chloromethyl)-mercury
McCrindle, Robert,Arsenault, Gilles J.,Farwaha, Rajeev,McAlees, Alan J.,Sneddon, David W.
, p. 761 - 766 (1989)
Treatment, with diazomethane, of a range of palladium dichloride and dibromide complexes containing chelaing ligands has been examined.With all but one, the formation of a mono(halogenomethyl) product was observed.The methylene insertion products from complexes of palladium dichloride are relatively stable if at least one olefin or phosphine ligand is present, but with bis-amine or -sulphide ligands the insertion products could not be isolated.However, all of the insertion products showed at least some tendency to revert to the starting dichloro complexes by loss of the methylene moiety.Products of insertion into a Pd-Br bond are less readily formed than those of the corresponding chloride and the resulting bromomethyl derivatives are less stable than their chloromethyl analogues.Chloromethyl derivatives were also prepared from the dichloride by treatment with bis(chloromethyl)mercury (only one of the two chloromethyl groups is transfered) or from a performed chloromethyl complex by ligand exchange.
Double-Decker Coordination Cages
Bandi, Sreenivasulu,Samantray, Sagarika,Chakravarthy, Rajan Deepan,Pal, Amlan K.,Hanan, Garry S.,Chand, Dillip Kumar
, p. 2816 - 2827 (2016)
Bis(pyridin-3-ylmethyl) pyridine-3,5-dicarboxylate (L) possessing one internal and two terminal pyridine moieties displayed differential coordination ability when combined with suitable PdIIcomponents. The compound L acted as a bidentate chelating ligand to form mononuclear complexes when combined with cis-[Pd(tmeda)(NO3)2] or Pd(NO3)2in calculated ratios. The combination of Pd(NO3)2with L in a ratio of 3:4, however, afforded the trinuclear “double-decker” cage [(NO3)2?Pd3(L)4](NO3)4, in which L acts as a nonchelating tridentate ligand and the counter anion (i.e., NO3–) acts as template. The encapsulated NO3–can be replaced by F–, Cl–, or Br–but not by I–. The F–-encapsulated cage could not be isolated due to its reactivity, whereas the Cl–or Br–encapsulated cages could be isolated. Although anionic guests such as NO3–, Cl–, or Br–stabilized the cages, the presence of excess Cl–or Br–(not NO3–) facilitated decomplexation reactions releasing the ligand. The complexation of Pd(Y)2(Y = BF4–, PF6–, CF3SO3–, or ClO4–) with L afforded the corresponding mononuclear complexes under appropriate conditions. However, these counter anions could not act as templates for the construction of double-decker cages.
Metal-binding sites of N-acetylneuraminic acid
Illi, Sarah,Schulten, Johanna,Kluefers, Peter
, p. 77 - 83 (2013)
Sialic acid represents a group of thirty derivates of neuraminic acid with various substituents at the amino residue and the alcoholic hydroxy groups. We analysed the behaviour of the tetracoordinated metal ions palladium(II) and silicon(IV) against the most important derivative N-acetylneuraminic acid (NANA). The molecular structures were assigned by a combined 1H, 13C and 29Si NMR-spectroscopic approach. Despite the presence of many different functional groups, the coordination chemistry of NANA with PdII follows established rules. Coordination via the N-acetyl-group - sterically impossible with PdII - was realised with SiIV. Copyright