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'Autocatalysis' in keywords
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1990 (1)
1983 (2)
1979 (1)
1Author    Szilvia Murányi, Horst-Dieter FörsterlingRequires cookie*
 Title    Chloride Induced Oscillations in the Classical Belousov-Zhabotinsky Reaction Explained by the "Radicalator"-Model  
 Abstract    We detected non-bromide controlled oscillations, which appear in a classical Belousov-Zhabotin-sky (BZ) system at a high malonic acid/bromate ratio in the presence of added chloride. The oscillations start immediately after the addition of the catalyst. To explain the oscillations we assume control by a synergetic process involving both chloride ions and malonyl radicals. The experiments are well in accordance with calculations based on the "Radicalator" model. This model is also capable of explaining the rate of formation of C0 2 in the BZ system. 
  Reference    Z. Naturforsch. 45a, 135—144 (1990); received October 24 1989 
  Published    1990 
  Keywords    Belousov-Zhabotinsky reaction, Bromous acid, Chloride, Autocatalysis 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0135.pdf 
 Identifier    ZNA-1990-45a-0135 
 Volume    45 
2Author    Günther Harsch, Monika Harsch, Wolfgang VoelterRequires cookie*
 Title    Mechanismus der autokatalytischen Primärreaktion bei der Formose-Reaktion Mechanism of the Autocatalytic Primary Reaction Step in the Formose Reaction  
 Abstract    New insights into the autocatalytic primary reaction step of the formose reaction are obtained by using soluble calcium hydroxide bismethylene glycolate complexes for kinetic investigations in homogeneous phase. The reaction kinetics follows between 20% and 80% formaldehyde consumption a nonlinear rate equation. Specific co-catalytic activities are determined for the most important intermediates and end products of the formose reaction. By correlation of the kinetic results with solubility experiments, ultraviolet, 13 C NMR spectroscopic measurements and rates of oxidation and acid formation, a mechanism for the autocatalytic primary reaction is given. The main catalytic effects for the formaldehyde activation are caused by calcium enediolate complexes in an autocatalytic cycle and competition with the Cannizzaro and oligomerisation reaction. Further, but less probable mechanisms are also discussed. 
  Reference    Z. Naturforsch. 38b, 1257—1268 (1983); eingegangen am 26. Mai 1983 
  Published    1983 
  Keywords    Formose Reaction, Autocatalysis, Cannizzaro Reaction, Lobry-de-Bruyn-van-Ekenstein Reaction 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1257.pdf 
 Identifier    ZNB-1983-38b-1257 
 Volume    38 
3Author    Günther Harsch, Monika Harsch, Hermann Bauer, Wolfgang VoelterRequires cookie*
 Title    Produktverteilung und Mechanismus der Gesamtreaktion der Formose-Reaktion Product Analysis and Mechanism of the Formose Reaction  
 Abstract    By means of liquid chromatographic analysis, UV, 13 C NMR and GC-MS spectroscopy it is possible to determine quantitatively the most important intermediate and final products of the formose reaction. As stable main products xylose, glucose and dendro-ketose, as stable side products ribose, lyxose, arabinose, mannose, dendroaldose, fructose and sorbose are identified. Instable intermediates are glycolaldehyde, glycerolaldehyde, dihydroxiacetone, erythrose, threose and pentuloses. Cannizzaro reaction, oligomerization and the primary formose reaction are catalyzed by a calcium hydroxide bismethylene glycolate complex. 
  Reference    Z. Naturforsch. 38b, 1269—1280 (1983); eingegangen am 26. Mai 1983 
  Published    1983 
  Keywords    Formose Reaction, Autocatalysis, Cannizzaro Reaction, Lobry-de-Bruyn-van-Ekenstein Rearrangement 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1269.pdf 
 Identifier    ZNB-1983-38b-1269 
 Volume    38 
4Author    P. Decker, Ö. SayginRequires cookie*
 Title    Alles-oder-nichts Verhalten und Bistabilität in einem einfachen Zellmodell mit Autokatalyse vom Typ A + 2 B = 3 B All-or-None Behaviour and Bistability in a Simple Cell Model with Autocatalysis of Type A + 2 B = 3 B  
 Abstract    Herrn Prof. Dr. Alfons Schöberl zum 75. G eburtstag gew id­ met. 
  Reference    Z. Naturforsch. 34c, 649 (1979); eingegangen am 18. Januar/3. April 1979 
  Published    1979 
  Keywords    Nonlinear Kinetics, Bistability, Autocatalysis, Cell M odel, A ll-or-Flip-or-N one Response 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0649_n.pdf 
 Identifier    ZNC-1979-34c-0649_n 
 Volume    34