1: ethyl acetoacetate With sodium hydride in tetrahydrofuran T=0°C; 0.25 h; 2: With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.333333 h; 3: 5-bromo-1-pentene in tetrahydrofuran; hexane T=20°C; 0.5 h; Further stages.;

1: ethanol / und Behandeln des Reaktionsprodukts mit wss.Natronlauge 2: diethyl ether; sodium hydride View Scheme

diethyl ether; sodium hydride

Yield given. Multistep reaction;