1: 75 percent / Caro's acid / ethanol / 1.) 5-10 deg C; 2.) room temperature, 1 day 3: 68 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0 °C View Scheme

1: 75 percent / Caro's acid / ethanol / 1.) 5-10 deg C; 2.) room temperature, 1 day 2: 80 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0 °C View Scheme

oxone in ethanol T=20°C; Oxidation; 24 h;