tetra(n-butyl)ammonium hydroxide in dichloromethane 12 h; Ambient temperatureIrradiation;

1: 96 percent / 85percent m-chloroperbenzoic acid / 1,2-dichloro-ethane / 3 h / 83 °C 2: 1.) 40percent aq. (n-Bu)4NOH / 1.) 1 h, 2.) CH2Cl2, hν, RT, 12 h View Scheme