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

1: 78 percent / diethyl ether; hexane / -40 deg C to r.t. 2: 42 percent / Li naphthalenide / tetrahydrofuran / 1) -20 deg C, 2) -78 deg C to 0 deg C View Scheme