[2,2']bipyridinyl; tetra-n-butylammonium tetrafluoroborate; ethylene dibromide in N,N-dimethyl-formamide T=20°C; Reformatsky reaction; Electrolysisnickel sponge cathode; iron sacrificial rod anode;

tetra-n-butylammonium tetrafluoroborate; zinc dibromide; zinc in acetonitrile Ambient temperature;