1: With [Ir(μ-Cl)(cyclooctene)2]2 in dichloromethane T=20°C; 0.5 h; 2: With hydrogenchloride in 1,4-dioxane; dichloromethane 0.5 h; regioselective reaction;

bis(1,5-cyclooctadiene)nickel (0); diethylaluminium chloride; cyclohexa-1,3-diene; triphenylphosphine in toluene T=50°C; 48 h; Yield given. Yields of byproduct given;

1: trimethylsilyl ethylene With titanium(IV) isopropylate; isopropylmagnesium chloride in diethyl ether T=-78 - -50°C; complexation; 2.5 h; 2: trimethylsilylacetylene in diethyl ether T=-50°C; Addition; 3: With hydrogen cation Hydrolysis; Further stages.;

AlEt1.5Cl1.5; triphenylphosphine; nickel dichloride T=100°C; 8 h; Further byproducts given. Yields of byproduct given;

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bis(1,5-cyclooctadiene)nickel (0); diethylaluminium chloride; triphenylphosphine in toluene T=50°C; 48 h; other ligands, var. P/Ni and Al/Ni ratios, var. reaction times; Product distribution;