1.1: LDA / tetrahydrofuran; hexane / 0.17 h / -78 °C 1.2: 66 percent / tetrahydrofuran; hexane / 18 h / 20 °C 2.1: 72 percent / LiAlH4 / diethyl ether / 1 h / 20 °C 3.1: 93 percent / PCC / CH2Cl2 / 1.25 h / 20 °C 4.1: 25 percent / m-methoxyacetophenone / CH2Cl2 / 7 h / Irradiation View Scheme

n-butyllithium; diisopropylamine in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide; hexane 1.) -78 deg C, 1 h, 2.) -40 deg C, 1 h;

sodium hydride