jones reagent in acetone T=0°C; 1 h;

1: 51 percent / n-BuLi / tetrahydrofuran; hexane / 1.) 0 deg C, 3 h, 2.) room temperature, 8 h 2: 60 percent / Jones reagent / acetone / 1 h / 0 °C View Scheme

sodium tetrahydroborate