ZfN: Search Results

1	Author	G. Abou-Elenien+, J. Rieser++, N. Ismail+++, K. Wallenfels	Requires 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

2	Author	Leopold Horner, Christoph Franz, Matthias	Requires 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

3	Author	Taka-Aki Nihei, Shin'. Ichi, Ishimaru, Ryuichi Ikeda	Requires 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

4	Author	Leopold Horner, Christoph Franz	Requires 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