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1995 (1)
1983 (1)
1Author    WolfJürgen RichterRequires cookie*
 Title    Asymmetrische Synthesen durch Substitution: Diastereomere Arsinite aus homochiral substituierten Arsoniten Asymmetrie Synthesis via Substitution: D iastereom eric Arsinites from Homochirally Substituted Arsonites  
 Abstract    Conceptually novel access to chiral arsinites is provided by reacting phenyl-0,0-dim enthyl-arsonite (1) with bulky nucleophiles e. g. terr-butyl-lithium or wo-propyl-lithium to yield the arsinites 3 and 4. The asymmetric induction determined by GC and NM R is 50% and 30% d.e. A small nucleophile effects double substitution. 
  Reference    Z. Naturforsch. 50b, 339—341 (1995); eingegangen am 15. September 1994 
  Published    1995 
  Keywords    Asymmetrie Induction, Chiral Arsonites, Arsinites 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0339.pdf 
 Identifier    ZNB-1995-50b-0339 
 Volume    50 
2Author    Henri Brunner, A.F M Mokhlesur RahmanRequires cookie*
 Title    Asymmetrische Katalysen, 13 [1] Chelat-Liganden und ihre Rhodium-Komplexe mit seitlichen Asymmetriezentren und ihre Anwendung in der enantioselektiven Katalyse Asymmetric Catalyses. 13 [1] Chelate Ligands and their Rhodium Complexes with Lateral Asymmetrie Centers and their Use in Enantioselective Catalysis  
 Abstract    The chelate ligands 1-3 with lateral asymmetric centers at the nitrogen atoms were prepared and characterized. In the Rh complexes 4 and 5 the asymmetric centers directly interact with those coordination positions where during enantioselective catalysis pro-chiral substrates are converted into optically active products. The compounds 4 and 5, as well as the in situ catalysts [Rh(COD)Cl]2/2 were used in the asymmetric hydrogenation of a-N[acetamino]cinnamic acid and in the asymmetric hydrosilylation of acetophenone with diphenylsilane. The low optical inductions obtained result from the catalyst loosing its chiral information during catalysis due to racemization or fragmentation. 
  Reference    Z. Naturforsch. 38b, 1332—1338 (1983); eingegangen am 16. Mai 1983 
  Published    1983 
  Keywords    Optical Activity, Asymmetrie Induction, Enantioselective Catalysis 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1332.pdf 
 Identifier    ZNB-1983-38b-1332 
 Volume    38