jones reagent in acetone 0.25 h; Ambient temperature;

1: 73 percent / n-BuLi / tetrahydrofuran / 1.) -20 deg C, 2 h, 2.) r.t., 4 h 2: 94 percent / p-toluenesulfonic acid / methanol / 3 h / Ambient temperature 3: 85 percent / Jones reagent / acetone / 0.25 h / Ambient temperature View Scheme

1: 94 percent / p-toluenesulfonic acid / methanol / 3 h / Ambient temperature 2: 85 percent / Jones reagent / acetone / 0.25 h / Ambient temperature View Scheme