1: n-butyllithium With copper(l) iodide in diethyl ether 2: cyclohept-2-en-1-one in diethyl ether T=-78°C; 1 h; 3: With Mukayama reagent in tetrahydrofuran; diethyl ether T=-78 - 20°C; 16 h;

aluminum oxide; pyridinium chlorochromate in dichloromethane T=20°C; 2 h;

1: 26 percent / diethyl ether; hexane / 0 - 20 °C 2: 47 percent / pyridine chlorochromate; basic alumina / CH2Cl2 / 2 h / 20 °C View Scheme

Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;