sodium hydroxide 1.) DMSO, r.t., 2h; 2.) r.t., 30 min; Yield given. Multistep reaction;

ammonium hydroxide; mercury(II) oxide in N,N-dimethyl-formamide T=40°C; 4 h; also with other bis(dithiocarbamates) to form the corresponding p-arylenediisothiocyanates;

mercury(II) oxide in N,N-dimethyl-formamide 8 h; Heating;