potassium carbonate; zinc; 1,1'-bis-(diphenylphosphino)ferrocene; niobium bromide in N,N-dimethyl-formamide T=60°C; 5 h; Title compound not separated from byproducts;
potassium carbonate; zinc; 1,1'-bis-(diphenylphosphino)ferrocene; niobium bromide in N,N-dimethyl-formamide T=60°C; 2 h; Title compound not separated from byproducts;
potassium carbonate; zinc; 1,1'-bis-(diphenylphosphino)ferrocene; niobium bromide in N,N-dimethyl-formamide T=25°C; 10 h; Yields of byproduct given. Title compound not separated from byproducts;
