Journal of the Chemical Society. Perkin transactions II p. 2005 - 2012 (1995)
Update date:2022-08-11
Topics:
Pletcher, Derek
Slevin, Louise
The use of an Mg anode in an undivided cell alters the products from many electrosynthetic reactions.In an attempt to understand this phenomenon, the influence of MgII ions on the mechanism for the reduction of benzoate esters in DMF has been investigated.It is confirmed that the presence of MgII in solution leads to a change in the major reaction pathway from cleavage of the ester linkage (to give benzoate ion) to dimerisation (to a diketone).The dimer is then reduced further at the same potential.Cyclic voltammetry shows that in the absence of MgII, the ester radical anion is stable, while in the presence of MgII, the radical anion dimerises rapidly and the MgII also catalyses further reduction.Voltammmetry within the synthesis cell, however, shows that much of the MgII formed by dissolution of the anode is tied up by anionic products and that the dimerisation of the radical anion must occur well away from the cathode surface.
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