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1997 (1)
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1Author    Hans Möhrle, Heinz DwuletzkiRequires cookie*
 Title    Acylation Reactions of Enamines  
 Abstract    The ratio of isomeric enaminones, obtained by acylation of enamines with acid chlorides in the presence of triethylamine, depends on the possibility of forming isomeric enoles of the inter-mediate cyclobutanone adducts. 
  Reference    Z. Naturforsch. 42b, 503—506 (1987); eingegangen am 30. Oktober 1986 
  Published    1987 
  Keywords    Enamines, Enaminones, 1, 4, 5, 6-Tetrahydropyridines 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0503.pdf 
 Identifier    ZNB-1987-42b-0503 
 Volume    42 
2Author    Uwe Kuckländer, KrystinaK. Una, Gabriele Zerta, Wolfgang PollRequires cookie*
 Title    Untersuchung zur 6 -Hydroxyindol-Bildung bei der Nenitzescu-Reaktion, IV [1] Cyclisierung von N-(Chinonylalkyl)enaminon-Derivaten, II [2] Investigation on the F orm ation of 6 -F[ydroxyindole in the Nenitzescu Reaction, IV [1] Cyclization of N-(Quinonylalkyl)enam inone Derivatives, II [2]  
 Abstract    Quinonylmethylenaminones 5 and 6 are synthesized and cyclized to spiro com pounds 7 and 8. Quinonylpropylenaminone 15 is made in the same way. Cyclization in acetic acid yields qui-nolines 11 and 12, in trifluoroacetic acid/trifluoroacetic anhydrid diacylenamine 16 is ob­ tained. The product o f 15 in perchloric acid is benzazocine 20. The structure o f 20 is proven by X-ray analysis. The course o f the reaction is discussed. 
  Reference    Z. Naturforsch. 47b, 1403—1410 (1992); eingegangen am 17. April 1992 
  Published    1992 
  Keywords    Spirocyclization, Quinones, Enaminones, Benzofurano-azocin, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1403.pdf 
 Identifier    ZNB-1992-47b-1403 
 Volume    47 
3Author    H. Möhrle, M. JeandréeRequires cookie*
 Title    ,3-Dioxolane von N-substituierten 4-Piperidonen als Dehydrierungssubstrat 1,3-Dioxolanes of N-Substituted 4-Piperidones as Substrates for Dehydrogenations  
 Abstract    The applicability of ketals was examined for masking the carbonyl group in N-tertiary 4-piperidones during the dehydrogenation using mercury-edta. Various 1,3-dioxolanes showed a different behaviour in dependence on the N-substituent. With simple aliphatic moieties mainly dehydrogenated but hydrolyzed products were received. These enaminones were also available from the dehydrogenations of the corresponding 4-piperidones. Similar applied to para-acyl-aromatic substituted derivatives but with less yields. Aromatic substituents bearing a neighbour group on ortho-position with participation gave rise to different oxidation products partially with preservation of the ketal structure. 
  Reference    (Z. Naturforsch. 52b, 72—78 [1997]; eingegangen am 23. August 1996) 
  Published    1997 
  Keywords    Ketals, Enaminones, N, 0-A cetals, Lactams, Dehydrogenation with Hg-EDTA Complex 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0072.pdf 
 Identifier    ZNB-1997-52b-0072 
 Volume    52