sodium acetate in acetic acid 0.5 h;

sodium dithionite in ethanol 1 h; Ambient temperature;

1: 42 percent / 10percent Na2S2O4 / ethanol / 1 h / Ambient temperature 2: 43 percent / methanol; diethyl ether / 2 h / Ambient temperature View Scheme

1: 42 percent / 10percent Na2S2O4 / ethanol / 1 h / Ambient temperature 2: 76 percent / ethyl acetate / 1.) 3 h, reflux, 2.) 12 h, room temp. View Scheme

1: 42 percent / 10percent Na2S2O4 / ethanol / 1 h / Ambient temperature 2: 43 percent / methanol; diethyl ether / 2 h / Ambient temperature 3: 84 percent / ethyl acetate / 1.) 3 h, reflux, 2.) 12 h, room temp. View Scheme

1: 42 percent / 10percent Na2S2O4 / ethanol / 1 h / Ambient temperature 2: 43 percent / methanol; diethyl ether / 2 h / Ambient temperature 3: 84 percent / ethyl acetate / 1.) 3 h, reflux, 2.) 12 h, room temp. 4: 30 percent / NaI / acetone / 2 h / Ambient temperature View Scheme