Cl2Ni(1,2-bis(diphenylphosphino)ethane) in diethyl ether T=-10°C; 3 h;

1: 34 percent / FeSO4.7H2O, 70percent tert-butyl hydroperoxide / H2O / 0.25 h / 10 - 20 °C 2: 1.) H2NNH2.H2O 2.) KOH / 1.) EtOH, reflux, 2 h 2.) diethyleneglycol, 170 deg C, 2 h View Scheme

potassium hydroxide; hydrazine hydrate 1.) EtOH, reflux, 2 h 2.) diethyleneglycol, 170 deg C, 2 h; Yield given. Multistep reaction;