1: (2-methyl-1-propenyl)carbonyl chloride With AlCl3, aluminium chloride in dichloromethane T=-60°C; Inert atmosphere; 2: Dimethyl-(2-methylene-but-3-enyl)-phenyl-silane in dichloromethane T=-60°C; 0.25 h; Inert atmosphere; Further stages;

1: AlCl3 / CH2Cl2 / 0.25 h / -60 °C 2: DIBAH / toluene / 4 h / -40 - 0 °C View Scheme

aluminium trichloride in dichloromethane T=-60°C; 0.25 h;