1: DIBAL 2: PCC View Scheme

1.1: sodium tetrahydroborate; copper(l) chloride / tetrahydrofuran; methanol / 6 h / 0 °C / Inert atmosphere 2.1: water; potassium hydroxide / 1,4-dioxane / 12 h / 23 °C / Inert atmosphere 2.2: Inert atmosphere View Scheme

sodium tetrahydroborate; copper(l) chloride in tetrahydrofuran; methanol T=0°C; 6 h; Inert atmosphere;