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'Hydrogen Transfer' in keywords
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2000 (1)
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1981 (1)
1Author    G. Abou-Elenien+, J. Rieser++, N. Ismail+++, K. WallenfelsRequires cookie*
 Title    Kinetische Untersuchungen zur Wasserstoffübertragung von Dihydropyridinen auf Hydrazyle Kinetic Investigation on the Hydrogen Transfer from Dihydropyridines to Hydrazyls  
 Abstract    The results of a kinetic study on the hydrogen transfer between different dihydro-pyridines and mono-, bis-and trishydrazyls of the tricyanobenzene series are described. The reactions have been found to obey in all cases a second-order law. The influences of solvent medium, redox-potentials of the reactants and temperature on the rates of reactions have been investigated. 
  Reference    Z. Naturforsch. 36b, 391—394 (1981); eingegangen am 26. November 1980 
  Published    1981 
  Keywords    Dihydropyridines, Hydrazyls, Hydrogen Transfer, Kinetics 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0391.pdf 
 Identifier    ZNB-1981-36b-0391 
 Volume    36 
2Author    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 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0822.pdf 
 Identifier    ZNB-1985-40b-0822 
 Volume    40 
3Author    Taka-Aki Nihei, Shin'. Ichi, Ishimaru, Ryuichi IkedaRequires cookie*
 Title    C1 NQR Studies of Hydrogen Transfer in Crystalline /7-Chlorobenzoic Acid  
 Abstract    35 C1 NQR frequencies and spin-lattice relaxation times 7, Q were measured inp-ClC 6 H 4 C0 2 H(PCB A) and p-ClQF^CC^DtPCBA-d,) at 77-333 K. T lQ in PCB A gave a shallow minimum of 8.0 ms at ca. 110 K, which could be explained by a double proton transfer mechanism in the carboxylic acid dimer referring to *H NMR data giving a T 1H minimum at almost the same temperature. PCBA-d, showed temperature dependent NQR frequencies quite analogous to those in PCBA, whereas their r 1Q behavi-our was quite different in its minimum value and its temperature as well as temperature gradient. These results were explained by suppressed deuteron tunnelling and the Ubbelohde effect. 
  Reference    Z. Naturforsch. 55a, 355—358 (2000); received August 27 1999 
  Published    2000 
  Keywords    CI NQR, Hydrogen-Bond, Hydrogen-transfer, Tunneling 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0355.pdf 
 Identifier    ZNA-2000-55a-0355 
 Volume    55 
4Author    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 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0814.pdf 
 Identifier    ZNB-1985-40b-0814 
 Volume    40