n-butyllithium; Methyltriphenylphosphonium bromide in tetrahydrofuran; hexane T=-78 - 20°C; 2 h;

1: Methyltriphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; hexane T=-78 - 20°C; 2: bicyclolt;4.2.0gt;octa-1,3,5-triene-3-carboxaldehyde in tetrahydrofuran; hexane T=-78 - 20°C; Wittig olefination; 2 h; Further stages.;

hydrogenchloride; triethylamine; hexane in diethyl ether; water; acetonitrile

1.1: Mg; 1,2-dibromoethane / tetrahydrofuran / 0.75 h / Heating 1.2: 81.2 percent / tetrahydrofuran / 0.25 h 2.1: n-BuLi / tetrahydrofuran; hexane / -78 - 20 °C 2.2: 78 percent / tetrahydrofuran; hexane / 2 h / -78 - 20 °C View Scheme