1: With 4-bromo-benzoic acid ethyl ester; trifluoroacetic acid; cobalt(II) dibromide; zinc in 1.4-dicyano 1-butene; acetonitrile 0.166667 - 0.5 h; 2: para-bromoacetophenone With zinc dibromide in 1.4-dicyano 1-butene; acetonitrile T=20°C; Product distribution / selectivity;

trifluoroacetic acid; cobalt(II) dibromide; zinc dibromide in acetonitrile the mixt. in CH3CN was stirred at room temp., then arylbromide was added, stirred at room temp.; GC analysis;

1: zinc With 3-chloroprop-1-ene; trifluoroacetic acid; cobalt(II) dibromide in acetonitrile T=20°C; 0.05 h; 2: para-bromoacetophenone in acetonitrile T=20°C;

triethylamine in acetonitrile T=0 - 20°C; Inert atmosphere; Reagent/catalyst;

in N,N-dimethyl-formamide Ambient temperature; Yield given;