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

Abstract 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.