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'Intramolecular Cyclization' in keywords Facet   section ZfN Section B  [X]
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1999 (1)
1997 (1)
1Author    Tristram Chivers, Masood Parvez, Peter ZoricakRequires cookie*
 Title    Preparation and X-Ray Structure of 4-BrC6H4CNSC(Cl)N  
 Abstract    The title compound was obtained in 82% yield by the intramolecular cyclization of 4-BrC6H4C(NSCCl3)[N(SiMe3)2] in CH2CI2 at 23°C. It crystallizes in the triclinic system, space group PI, a = 7.957(3) Ä, b = 10.864(5) A, c = 5.625(1) A, a = 95.94(3)°, ß = 97.79(2)°, 7 = 100.72(3)°, V = 469.2(3) A3, and Z -2. The bond lengths of the planar C2N2S ring indicate partial 7r-delocalization. 
  Reference    Z. Naturforsch. 52b, 557—559 (1997); received September 5 1996 
  Published    1997 
  Keywords    Crystal Structure, 1, 2, 4-Thiadiazole, Intramolecular Cyclization 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0557.pdf 
 Identifier    ZNB-1997-52b-0557 
 Volume    52 
2Author    Hans Möhrle, Georg KellerRequires cookie*
 Title    a-Dicarbonylmonoxime als Nucleophile und Nachbargruppen a-Dicarbonylm onoxim es as Nucleophiles and Neighbour Groups  
 Abstract    The Q-dicarbonylmonooximes 1 and 11 do not react as simple "CH-acidic-compounds" in the Mannich condensation. In a concerted reaction with aminals in absolute dioxane they give rise to the products 4a -e and 12a -e with better practicability and much higher yields compared with the conventional method. The Mannich bases with a cyclic amine part show in the dehydrogenation, using mercury-EDTA, a neighbouring group participation of the oxime in type 4 and of the oxime or amide function in 12 yielding cyclized products. For the reaction a plausible mechanism is proposed. 
  Reference    Z. Naturforsch. 54b, 632—642 (1999); eingegangen am 27. Januar 1999 
  Published    1999 
  Keywords    Aminal, C-Aminomethylation, Mercury(II)-EDTA Dehydrogenation, Intramolecular Cyclization 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0632.pdf 
 Identifier    ZNB-1999-54b-0632 
 Volume    54