trisodium phosphorothioate in methanol Heating;

tetraphosphorus decasulfide in carbon disulfide 7.5 h; Heating; Yield given. Yields of byproduct given;

1: 92 percent / m-chloroperoxybenzoic acid / CH2Cl2 / 1.) 2 h, room temperature, 2.) 3h, reflux 2: NBS, BPO / CCl4 / 50 h / Heating 3: 97 percent / sodium methoxide / methanol / 16.5 h / Ambient temperature; var. of base View Scheme

1: 92 percent / m-chloroperoxybenzoic acid / CH2Cl2 / 1.) 2 h, room temperature, 2.) 3h, reflux 2: NBS, BPO / CCl4 / 50 h / Heating 3: 97 percent / sodium methoxide / methanol / 16.5 h / Ambient temperature; var. of base 4: 58 percent / Br2 / CCl4 / Ambient temperature View Scheme