1: 17 percent / Ph3P / NiCl2(Ph3P)2, Zn / dimethylformamide / 18 h 2: 1) NaOMe, 2) H2 / 2) palladium-charcoal / 1) methylene dichloride, methanol, 1h, 2) ethyl acetate, methanol 3: 91 percent / K2CO3 / acetone / 6 h / Heating 4: 100 percent / PBr3 / benzene / 80 °C 5: 15 percent / sodium, tetraphenylethene / tetrahydrofuran / 24 h View Scheme

With  Ni(O)(Ph3P)4