Catalytic Reduction of Diphenylacetylene by Zinc over Palladium-Carbon Using Viologens as Electron Mediators

Article abstract of DOI:10.1246/cl.1988.1033

Diphenylacetylene was reduced over palladium-carbon in methanol-water mixture in presence of zinc using N,N'-dialkyl-4,4'-bipyridinium ions (viologens) as mediators giving cis-stilbene as the major product and bibenzyl as the minor one.The reaction involved the direct contact of zinc with the catalyst.