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1996 (1)
1994 (1)
1Author    Johann Polin2, Herwig Schottenbergerb, KarlE. Berhard, Schw Arzhansb, H. P. FritzRequires cookie*
 Title    Asymmetrie Ethynes. Syntheses of Ethynylferrocene Paradigms  
 Abstract    Synthetic methods to bifunctional ethynes have been examined. Direct ethynylation, the Stephens-Castro reaction, the Pd-catalysed Hagihara coupling, transmetalation reactions and nucleophilic additions have been evaluated in the preparation of substituted ferrocenylethynes with intended use of these materials in electrochemical and nonlinear optical investigations. Asymmetric ferrocenylethynes are promising candidates for applications in contemporary ma­ terials science. Synthetically, 1,4-bis(ferrocenylethynylene)benzene (1), l,3,5-tris(ferrocenyl-ethynylene)benzene (2), and 9 ,10-bis(ferrocenylethynylene)anthracene (3) are obtained in high yields, whereas 4-ferrocenylethynylene-2,3,5,6-tetrafluorostyrene (4) and potassium (ferro-cenylethynylene)triphenyl borate (5) are accessible in only moderate yields. Further extension of this chemistry to additional heteronuclear bimetallic coordination compounds has been at­ tempted, but without success due to severe difficulties in both preparation and characterization of these materials. 
  Reference    Z. Naturforsch. 51b, 1683—1690 (1996); received June 10 1996 
  Published    1996 
  Keywords    Ethynylferrocene, Donor-Acceptor Systems, Coupling Reactions 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1683.pdf 
 Identifier    ZNB-1996-51b-1683 
 Volume    51 
2Author    Akinori ShiotaniRequires cookie*
 Title    Die Pd-katalysierte oxidative Kupplungsreaktion von Methylbenzoesäuremethylester The Pd-Catalyzed Oxidative Coupling Reaction of Methyl Methylbenzoates  
 Abstract    The Pd-catalyzed oxidative coupling reaction of methyl o-toluate gives, in the presence of a Pd/l,10-phenanthroline(phen)/Cu catalyst, exclusively, the para-linked biphenyldicarboxy-lates 1, 2, and 3. On the other hand, the meta-linked biphenyldicarboxylates 4 and 5, were predominantly formed in a catalyst system of Pd/2,4-pentanedione(acacH)/Cu, and under similar conditions 6 and 7 were also obtained from the coupling reaction of methyl m-toluate and methyl p-toluate, respectively. A reaction scheme has been proposed. 
  Reference    Z. Naturforsch. 49b, 1731—1736 (1994); eingegangen am 21. April 1994 
  Published    1994 
  Keywords    Coupling Reaction, Steric Influence, Palladium, 1, 10-Phenanthroline, 2, 4-Pentanedione 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1731.pdf 
 Identifier    ZNB-1994-49b-1731 
 Volume    49