1: lt;(E)-3-Pentenylgt;triphenylphosphonium-bromid With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-20°C; 1 h; 2: 9-acetoxy-nonanal in tetrahydrofuran; hexane T=-60 - 20°C; Wittig reaction; Further stages.;

1: lt;(E)-3-Pentenylgt;triphenylphosphonium-bromid With n-butyllithium in tetrahydrofuran; hexane T=-70°C; 0.5 h; 2: 9-acetoxy-nonanal in tetrahydrofuran; hexane T=-70 - 20°C; Wittig reaction; Further stages. Title compound not separated from byproducts.;

1: Na-HMDS 2: 62 percent / -78 °C View Scheme