Cyclic polysulfides fused to polyaromatics

Pentathiepins fused to naphthalene and phenanthrene have been synthesized by a simple method. Ring size depends on the stability of generated products related to steric and electronic factors. Sometimes, delocalized π-electron of polyaromatics shows synergistic effect on the stabilization of polysulfur rings. The structures of two polysulfides were also studied by X-ray crystallography and phenanthrene bearing C₂S₅ ring showed different solid-state properties than corresponding phenanthrene bearing C₂S₃ ring.