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'Hydrogen Transfer' in keywords Facet   Publication Year 1985  [X]
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1Author    Leopold Horner, Christoph Franz, MatthiasRequires cookie*
 Title    Studien zum Vorgang der Wasserstoffübertragung, 76 [1] Der anomale Verlauf der Elektroreduktion von Cumarin mit Lithium als Leitsalzkation Versuche zur Reaktionslenkung durch Mediatoren Studies on the Occurrence of Hydrogen Transfer, 76 [1] The Anomal Course of the Electroreduction of Coumarine with Supporting Electrolyts Containing Li + Experiments to Influence the Reaction by Mediators  
 Abstract    In contradiction to the experience the hydrodimer is formed as the main product in the elec-troreduction of coumarine using lithium compounds as a supporting electrolyt. It is assumed that the lithium ions are coordinated internally with the radicalanion A resp. B derived from coumarine. In this way the hydrodimerization is favoured. From 18 different compounds added as possible mediators to the catholyt only pyridine influences moderately the ratio: hydro-dimerizationproduct/dihydroproduct. 
  Reference    Z. Naturforsch. 40b, 822—825 (1985); eingegangen am 6. Februar 1985 
  Published    1985 
  Keywords    Hydrogen Transfer, Coumarine, Electroreduction 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0822.pdf 
 Identifier    ZNB-1985-40b-0822 
 Volume    40 
2Author    Leopold Horner, Christoph FranzRequires cookie*
 Title    Studien zum Vorgang der Wasserstoffübertragung, 75 [1] Elektrochemische Untersuchungen von S-und P-vergiftetem Raney-Nickel (Ra—Ni) und Versuche zu dessen Reaktivierung Studies on the Occurrence of Hydrogen Transfer, 75 [1] Electrochemical Investigation of Raney-Nickel (Ra—Ni) Poisoned with S and P and Experiments for the Reactivation  
 Abstract    Ra—Ni with an artificial rest potential of —1000 mV (vs SCE) is shifted with different rates to more positive values after the addition of thioethers and carbon disulfide. Only with Na 2 S-9H 2 0 a potential of —1100 mV (constant) is observed. Ra—Ni poisoned with sulfur is not reactivated neither cathodically nor anodically nor by the corrosive degradation at constant pH. Hydrogen structurally incorporated into the lattice of Ra—Ni (structural bonded hydrogen) is consumed by poisoning with thioethers and trivalent phosphorus compounds in a stoichiometric way. Ra—Ni-powder stepwise corrosively degradated up to 30% shows the same degree of desulfuri-zation as the original Ra—Ni. Desactivated Ra—Ni (loss of structural bonded hydrogen) is reacti-vated (56%) by cathodical treatment. In competing reactions the P—S, C—S, and C —P-bond in thiophosphinic esters, thioethers and trivalent P-compounds are hydrogenolyzed by Ra—Ni, the C—P-bond faster than the C—S-bond. 
  Reference    Z. Naturforsch. 40b, 814—821 (1985); eingegangen am 31. Januar 1985 
  Published    1985 
  Keywords    Structural Bonded Hydrogen, Hydrogen Transfer, Raney-Nickel, Electrochemical Investigation 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0814.pdf 
 Identifier    ZNB-1985-40b-0814 
 Volume    40