1.1: n-BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 1.2: lithium naphthalenide / tetrahydrofuran; hexane / 2 h / -78 °C 1.3: tetrahydrofuran; hexane / -78 - -40 °C 2.1: 102 mg / diethyl ether; methanol; toluene / 0 °C 3.1: HCl / methanol / 3 h / 20 °C 3.2: 50 percent / CSA / benzene / 80 °C View Scheme