Using tetrakis(triphenylphosphine)palladium as catalyst and cesium carbonate as base, chloro iodobenzenes were reacted under refluxing 16 h at 112 ℃ in toluene to synthesize 23 polychlorinated diphenyl sulfides. All the products were characterized by IR and ¹H NMR spectra. The melting points of the products were also determined. The reaction processes have the advantages of simple work-up procedures, good yields and mild conditions. Thus this is a new and efficient method for the synthesis of polychlorinated diphenyl sulfide.

Key words: polychlorinated diphenyl sulfide, tetrakis(triphenylphosphine)palladium, chloro iodobenzene, chloro thiophenol