1: 1.) phenyllithium, 2.) cuprous iodide / 1.) ether, 1h, 25 deg C, 2.) ether, -78 deg C, 30 min 2: 2.) saturated aqueous NH4Cl / diethyl ether / 1.) -78 deg C, 4h, 2.) 0 deg C View Scheme

1: (3-methyl-2-butenyl)triphenylstannane With n-butyllithium in tetrahydrofuran; hexane 1.5 h; 2: diphenylchlorosilane in tetrahydrofuran; hexane T=-78°C; 1 h;