1: 37 percent / methanol / 1 h / Ambient temperature 2: 23 percent / H2S gas, NaOCH3 / methanol / 1.) RT, 2.3 h, 2.) 5 deg C, 18 h 3: 48 percent / mercuric(II) chloride, Et3N / dimethylformamide / 3 h / Ambient temperature View Scheme

in methanol 1 h; Ambient temperature;

dihydrogen peroxide; sodium hydrogencarbonate in 1,4-dioxane 1 h; Ambient temperature;

1: 37 percent / methanol / 1 h / Ambient temperature 2: 23 percent / H2S gas, NaOCH3 / methanol / 1.) RT, 2.3 h, 2.) 5 deg C, 18 h View Scheme

sodium hydride 1.) DMF, 78 deg C, 2.) 78 deg C, 4 h; Yield given. Multistep reaction;