1: piperazine With [2,2']bipyridinyl; nickel diacetate; sodium hydride; 1,1-dimethylpropan-1-ol in tetrahydrofuran T=65°C; 2 h; 2: para-dichlorobenzene With styrene in tetrahydrofuran T=65°C; 7 h;

T=130 - 140°C; 3 h;

T=140°C;