Li naphthalenide in tetrahydrofuran 1) -20 deg C, 1 h, 2) -78 deg C to 0 deg C, 20 min;

1: 78 percent / diethyl ether; hexane / -40 deg C to r.t. 2: 46 percent / Li naphthalenide / tetrahydrofuran / 1) -20 deg C, 1 h, 2) -78 deg C to 0 deg C, 20 min View Scheme