1: 1) sodium hydride / 1) THF, NaH, Cooled 2) room temp., 3 h 2: 98 percent Chromat. / tetrakis(triphenylphosphine)nickel(0), triethylaluminum / tetrahydrofuran; toluene / 4 h / 50 - 60 °C View Scheme

triethylaluminum; bis(acetylacetonate)nickel(II); triphenylphosphine in toluene T=60 - 80°C; 5 h;

Ni(PPh3)4; triethylaluminum in tetrahydrofuran; toluene T=80°C; 5 h; Further byproducts given. Title compound not separated from byproducts;

Ni(PPh3)4 in tetrahydrofuran; toluene T=80°C; 5 h; Further byproducts given. Title compound not separated from byproducts;

Ni(PPh3)4; triethylaluminum in tetrahydrofuran; toluene T=80°C; 5 h; Product distribution;