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1980 (2)
1Author    Werner Zeiß, Wolfgang Schwarz, Heinz HessRequires cookie*
 Title    995  
 Abstract    W. Zeiß et al. • (MePNMe)4S3, ein Cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazan) (MePNMe)4S3, a Cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazane) 31 P} Decoupling Octamethylcyclotetra(A 3 -phosphazane) (1) reacts with three mole equivalents of sulfur, added either in excess or in deficite, to give 2, the first cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazane). Its crystal structure determination shows a completely unsymmetrical molecule, which does not undergo ring inversion in solution. Thus an ABMX spin system with remarkably different AM and BM coupling constants is observed in the 31 P{ 1 H} NMR spectrum. By means of selective { 31 P} decoupling, all CH3 proton signals could be assigned in the 1 H NMR spectrum. 
  Reference    Z. Naturforsch. 35b, 959—963 (1980); eingegangen am 29. Februar 1980 
  Published    1980 
  Keywords    Cyclotetraphosphazane, Crystal Structure, NMR Spectra, Selective { 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0959.pdf 
 Identifier    ZNB-1980-35b-0959 
 Volume    35 
2Author    Walter Strohmeier, Manfred Michel, Luise WeigeltRequires cookie*
 Title    mit homogenen Ir-und Ru-Katalysatoren Selective Bulk-Hydrogenation of a,ß Unsaturated Ketones to Ketones with Homogeneous Ir and Ru Catalysts  
 Abstract    a,ß Unsaturated ketones are selectively hydrogenated to ketones in homogeneous bulk-catalysis under mild conditions by iridium-and ruthenium complexes. The range of mean turnover is from 6 to 196 depending on substrate, catalyst and reaction conditions. Selectivity ketone/alcohol depends on the degree of conversion and exceeds 100 on con-version of 90%. Einleitende Bemerkungen 
  Reference    Z. Naturforsch. 35b, 648—650 (1980); eingegangen am 7. Dezember 1979 
  Published    1980 
  Keywords    Catalysis, Homogeneous, Selective, Hydrogenation, Unsaturated Ketones 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0648.pdf 
 Identifier    ZNB-1980-35b-0648 
 Volume    35