Stage #1: With  n-butyllithium in  tetrahydrofuran T=-78°C; Negishi Coupling Reaction; 0.5 h; Stage #2: With  zinc(II) chloride in  tetrahydrofuran T=-78 - 20°C; 0.5 h; Stage #3: With  tetrakis(triphenylphosphine) palladium(0) in  tetrahydrofuran 48 h;  Product distribution / selectivity;  Show Experimental Procedure