nickel; 1,4-di(diphenylphosphino)-butane in benzene T=120°C; P=36775.4 Torr; 20 h; Yield given. Yields of byproduct given;

bis(1,5-cyclooctadiene)nickel (0); triphenylphosphine in benzene T=120°C; 20 h; Yield given;

carbon dioxide; nickel; 1,4-di(diphenylphosphino)-butane in benzene T=120°C; P=36775.4 Torr; 20 h; reaction of 3-hexyne catalyzed by Ni(cod)2-phosphine system under CO2 pressure; Product distribution;

nickel

lt;HNi(Ph2PCH2CH2PPh2)2gt;OCOCF3 in benzene T=120°C; 5 h; var. nickel catalysts, other dialkyl-substituted alkynes; Product distribution;