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Cathodically pretreated Raney-nickel-powder with a potential of -900 to -1000 mV (vs SCE) shows a positive potential shift of 200 to 300 mV in the presence of a hydrogen acceptor (coumarine or 1-ethinylcyclohexanol (1)). Pyridine and quinoline do not have any strong influence on the potential but retard the hydrogenation of coumarine. Acetylene derivatives as 1-ethinylcyclohexanol are hydrogenated in two steps applying a potential down to -1050 mV. At -1150 mV the selectivity is lost. With Raney-nickel-powder pre-treated with pyridine or hydrogensulfide the two-step selectivity of the hydrogenation of 1 is preserved applying also a potential of -1200 mV.

zeitschrift für naturforschung b

Studien zum Vorgang der Wasserstoffübertragung, 74 [1]. Elektroreduktive Hydrierungen an Raney-Nickel-Pulver als Kathode / Studies on the Occurrence of Hydrogen Transfer, 74 [1]. Electroreductive Hydrogenation Using Raney-Nickel-Powder as a Cathode