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'Photoreaction' in keywords Facet   Publication Year 1990  [X]
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1990[X]
1Author    CorneliusG. Kreiter, Wolfgang Michels, Reiner ExnerRequires cookie*
 Title    Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, XXXVII [1]: Photoreaktion von Dekacarbonyldirhenium mit Phenylallen Hindered Ligand M otions in Transition Metal Complexes, XXXVII [1]: Photoreaction of Decacarbonyldirhenium with Phenylallene  
 Abstract    Decacarbonyldirhenium (1) and phenylallene (2) form upon U V irradiation four dinuclear complexes: Decacarbonyl-//-^l:l-(3,4-diphenyl-1,5-hexadien-2,5-diyl)-dirhenium (3), ennea-carb on yl-//V :3-(3-phenyl-2-propen-l,2-diyl)-dirhenium (4), octacarb on yl-//-h yd rid o-/iV 2-(3-phenyl-l,2-propadien-l-yl)-dirhenium (5) and octacarbonyl-/i-?72 2-(phenyl-l,2-propa-diene)-dirhenium (6). The thermolabile complex 4 looses CO and forms the phenylallene bridged compound 6. Similarly 5 is rearranged to 6 by transfer o f the hydrido ligand to the 3-phenyl-1,2-propadien-l-yl bridge. The formation o f 3 and 4 can be rationalized via pentacar-bonyl-phenylpropenediyl-rhenium radicals which dimerize to give 3 or add pentacarbonyl-rhenium radicals, loose CO and form 4. The crystal and molecular structure o f 3 was deter­ mined by X-ray structure analysis. In the solid state the molecule is present in the ± ap confor­ mation. In solution at 233 K the ± a p , +sc, and -s c conform ations are equally populated. By a hindered rotation around a CC single bond, the three conformers are interconverted with a rotation barrier o f J G * 25g = 52.3 ± 1 k J -m o L 1. 
  Reference    Z. Naturforsch. 45b, 793—8 (1990); eingegangen am 3. Januar 1990 
  Published    1990 
  Keywords    Decacarbonyldirhenium, Photoreaction, Phenylallene, Ligand Properties 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0793.pdf 
 Identifier    ZNB-1990-45b-0793 
 Volume    45