triethylaluminum; pyridine; bis(acetylacetonate)nickel(II) in tetrahydrofuran; toluene T=80 - 100°C; 5 h;

Ni(PPh3)4 in toluene T=65°C; 5 h;

Ni(PPh3)4; 2,3-dicyano-5,6-dichloro-p-benzoquinone 1.)toluene, 65 deg C, 5 h 2.)toluene, reflux, 3 h; Yield given. Multistep reaction. Yields of byproduct given;