methanesulfonic acid; dihydrogen peroxide in diethyl ether 17 h; Ambient temperature;

1: 1.) tert-butyllithium / 1.) THF, pentane, 1 h, 0 deg C, 2.) 45 min 2: 40 percent / 90percent H2O2, CH3SO3H / diethyl ether / 17 h / Ambient temperature View Scheme