1: PhMe2SiLi in tetrahydrofuran T=0°C; 0.5 h; 2: 2,3-dimethyl-buta-1,3-diene in tetrahydrofuran T=-40°C; 3: With water in tetrahydrofuran Further stages.;

in cyclohexane Irradiation (UV/VIS); irradiation of catenate in cyclohexane containing a large excess of 2,3-dimethylbutadiene as trapping agent with a 110 W low pressure Hg arc lamp at room temp. under Ar for 1-4 h; identification by GC and GC-MS;

in cyclohexane 1 h; Ambient temperatureIrradiation;

methyl-magnesium iodide; manganese (II) chloride 1.) THF, 0 deg C, 10 min, 2.) THF, -78 deg C, 30 min; Yield given. Multistep reaction;

methyl-magnesium iodide; manganese (II) chloride multistep reaction; other reaction conditions; Product distribution;