Interestingly, the cyclic voltammograms of both monomer 1 and 2 contain cathodic peaks at -2.2 V versus Fc/Fc + . Investigating this result further by 1 H NMR spectroscopy revealed that electrochemical reduction of pentasulfide monomer 2 resulted in its partial desulfurization to form monomer 1 in addition to other products (S35-S36). Due to this complex reactivity profile, monomer 2 was not studied further in polymerization tests and focus was placed on trisulfide monomers 1, 3 and 4.