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In contradiction to the experience the hydrodimer is formed as the main product in the electroreduction 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: hydrodimerizationproduct/dihydroproduct.

zeitschrift für naturforschung b

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