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'Cyclopentadienyl' in keywords Facet   Publication Year 1991  [X]
Facet   section ZfN Section B:Volume 046  [X]
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1Author    Helmut Werner, JoachimM. AhrRequires cookie*
 Title    Cyclopentadienyl-, Indenyl-und Trifluormethylcyclopentadienyl-Cobalt- Komplexe mit Akzeptor-substituierten Olefinen als Liganden Cyclopentadienyl, Indenyl and Trifluoromethylcyclopentadienyl Cobalt Complexes with Acceptor-Substituted Olefins as Ligands  
 Abstract    The complexes C5H 5C o(P M e3)2 (1), C9H 7C o(P M e3)2 (2) and (C5H4C F 3)C o(PM e3)2 (3) react with m ono-and disubstituted ethenes such as styrene, acrylic acid methylester, methylvinyl-ketone, acroleine, acrylic acid amide, acrylonitrile, maleic anhydride, maleic and fumaric acid dimethylester, and fumaric dinitrile to give the olefin(phosphane)cobalt compounds (ring)Co(PM e3)(olefin) (4 -3 2) in good to excellent yields. With acrylonitrile, two different rotamers are obtained which indicates that there is a considerable energy barrier for rotation around the m eta l-o lefin bond. The reactions o f 1 and 3 with maleic acid dimethylester (M D E) lead not only to the formation o f the expected products (ring)Co(PM e3)(M D E) (22, 23) but also to the thermodynamically favored isomers (ring)Co(PM e3)(F D E) (24, 26) contain­ ing fumaric acid dimethylester (F D E) as ligand. A similar isomerization has been observed upon treatment o f 2 and 3 with fumaric dinitrile (F D N) which gives besides the com ­ plexes (ring)Co(PM e3)(F D N) (29, 31) also the maleic dinitrile (M D N) derivatives (ring)Co(PM e3)(M D N) (30, 32). The olefin(trim ethylphosphane)cobalt compounds are sur­ prisingly inert and neither on photolysis nor on heating give the isomeric hydrido(vinyl)metal complexes. 
  Reference    Z. Naturforsch. 46b, 1364—1376 (1991); eingegangen am 28. Mai 1991 
  Published    1991 
  Keywords    Cyclopentadienyl, Indenyl, Trifluoromethylcyclopentadienyl Cobalt Complexes, Ligand Displacement Reactions, Hindered R otation 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1364.pdf 
 Identifier    ZNB-1991-46b-1364 
 Volume    46