tetraethylammonium iodide; iodine cloride in dichloromethane T=-78°C; Addition; Dimerization;

1: (3Z,5Z)-4,5-diethyl-3,6-diiodoocta-3,5-diene With tert.-butyl lithium in tetrahydrofuran; pentane T=-60°C; 1 h; 2: chloro-trimethyl-silane With triethylamine in tetrahydrofuran; pentane T=20°C; 1.5 h;

1: With tert.-butyl lithium in tetrahydrofuran cooling; 2: With methanol in tetrahydrofuran

1: (3Z,5Z)-4,5-diethyl-3,6-diiodoocta-3,5-diene With tert.-butyl lithium in tetrahydrofuran T=-64 - -52°C; 1 h; 2: methyl iodide in tetrahydrofuran T=20°C; 1.5 h;

1: With tert.-butyl lithium in tetrahydrofuran cooling; 2: With methanol in tetrahydrofuran