1: diiodomethane With diethylzinc; trifluoroacetic acid in hexane; dichloromethane T=0°C; 0.75 h; 2: 1-methyl-4-(3-methylbut-1-en-2-yl)benzene in hexane; dichloromethane T=0 - 20°C; 3.91667 h;

1.1: n-butyllithium / hexane; tetrahydrofuran / 1.83 h / -70 - 20 °C 1.2: 2.42 h / Reflux 2.1: trifluoroacetic acid; diethylzinc / dichloromethane; hexane / 0.75 h / 0 °C 2.2: 3.92 h / 0 - 20 °C View Scheme