1.1: n-butyllithium / hexane; tetrahydrofuran / 3 h / -78 °C 1.2: 55 percent / hexane; tetrahydrofuran / -78 - 20 °C 2.1: P2O5 / light petroleum / 20 °C 3.1: 57 percent / H2 / 5 percent Pd/C / light petroleum / 12 h / 20 °C 4.1: n-butyllithium / hexane; tetrahydrofuran / 2.5 h / -78 °C 4.2: hexane; tetrahydrofuran / -78 - 20 °C 5.1: 98 percent / 10 percent aq. HCl / 1 h / 20 °C View Scheme

1.1: n-butyllithium / hexane; tetrahydrofuran / 3 h / -78 °C 1.2: 55 percent / hexane; tetrahydrofuran / -78 - 20 °C 2.1: P2O5 / light petroleum / 20 °C 3.1: 57 percent / H2 / 5 percent Pd/C / light petroleum / 12 h / 20 °C 4.1: n-butyllithium / hexane; tetrahydrofuran / 2.5 h / -78 °C 4.2: hexane; tetrahydrofuran / -78 - 20 °C 5.1: 98 percent / 10 percent aq. HCl / 1 h / 20 °C View Scheme