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1982 (1)
1Author    Alfred Gieren, Viktor Lamm, Dieter Oesterhelt, Hans-Jörg SchludeRequires cookie*
 Title    Röntgenstrukturanalyse des 4-Keto-a//-*rcms-retinals X-ray Structure Analysis of the 4-Keto-aW-/rafts-retinal  
 Abstract    The title compound (C20H26Ü2) crystallizes in the monoclinic space group P2i/n with a = 14.761(2), 6 = 8.292(1), c = 15.210(2) Ä, /S= 102.40(1)°; Z = 4. The structure was solved by direct methods and refined by least squares to a final R-value of 0.038 for 1211 observed reflections. The crystal structure is isomorphous with that of all-trans-retinal. The cyclohexenone ring shows a half-boat conformation. The connection of the cyclo-hexenone ring and the conjugated polyene chain via a formal single C-C bond is s-cis. The torsion angle C(5)-C(6)-C(7)-C(8) amounts to 56°. For the polyene side chain the typical curvature is evident. A comparison with analogous compounds shows that details in conformation, especially at the ring side-chain connection, are induced by crystal matrix. It seems that the differences in biological activity between retinal analogous compounds are not reflected by conformational differences of the free molecules. 
  Reference    Z. Naturforsch. 37b, 1612—1622 (1982); eingegangen am 1. Juni 1982 
  Published    1982 
  Keywords    N-ray, Retinal, Conformation 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1612.pdf 
 Identifier    ZNB-1982-37b-1612 
 Volume    37