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1995 (1)
1Author    GuyC. Lloyd-Jones, Andreas PfaltzRequires cookie*
 Title    Synthesis and Structures of Low-Valent Tungsten Complexes Bearing Chiral Oxazoline-Derived Ligands  
 Abstract    The synthesis of low-valent tungsten (0 and II) complexes bearing chiral bidentate phos-phino-oxazoline or bisoxazoline ligands is described. The structures of four of the complexes have been determined by single crystal X-ray analyses. Tungsten(II)-allyl complexes of the type [W(CO)2(PN)(C3H 5)Cl] (PN = phosphino-oxazoline) are fluxional in solution, but can be crystallized as single diastereoisomers. The complex [W (CO)3(PN)(CH 3CN)], which also crystallizes as a single diastereoisomer, is readily oxidized in solution and solid state, in stark contrast to analogous compounds bearing four carbonyl ligands [W(CO)4(PN)] or [W(CO)4(NN)] (NN = bisoxazoline) which were found to be stable. [W (CO)3(PN)(CH 3CN)] functions as a highly enantioselective catalyst in allylic substitution reactions with dimethyl sodiomalonate, whereas complexes of the type [W (CO)2(P N)(Z -C 3H 4)X)] (Z = H, Ph; X = Cl, Br) failed to yield allylic alkylation products. 
  Reference    Z. Naturforsch. 50b, 361—367 (1995); received Septem ber 26 1994 
  Published    1995 
  Keywords    Chiral Tungsten Complexes, Phosphino-oxazoline Ligands, Bisoxazoline Ligands, Tungsten Allyl Complexes, Asymmetric Catalysis 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0361.pdf 
 Identifier    ZNB-1995-50b-0361 
 Volume    50