in tetrahydrofuran; diethyl ether 14 h; Ambient temperature;

1: 81 percent / 15percent aq. H2O2 / acetic acid / 3.5 h / 100 °C 2: 1.) (CH3)2SO4 / 1.) 14 h, r.t., 2.) 50percent aq. EtOH, 14 h, r.t. 3: 61 percent / diethyl ether; tetrahydrofuran / 14 h / Ambient temperature View Scheme

1: 1.) (CH3)2SO4 / 1.) 14 h, r.t., 2.) 50percent aq. EtOH, 14 h, r.t. 2: 61 percent / diethyl ether; tetrahydrofuran / 14 h / Ambient temperature View Scheme