n-butyllithium in diethyl ether; hexane T=-78 - 20°C; 16 h;

1: 1,1,1,2,2,2-hexabutyl-distannane With n-butyllithium in tetrahydrofuran; hexanes T=0 - 20°C; 0.25 h; 2: 5-Bromo-2-chloropyridine in tetrahydrofuran; hexanes T=20°C; 4 h;

1: ethyl 4-bromobutanoate With nickel(II) bromide trihydrate; bathophenanthroline in N,N-dimethyl-formamide T=40°C; 0.333333 h; 2: 2-chloro-5-(tributylstannyl)pyridine With manganese in N,N-dimethyl-formamide T=40°C; Sealed tube;