Innovative solutions to some of these challenges have been reported recently. For instance, accelerators and catalysts have been reported by the Pyun and Hasell laboratories that allow inverse vulcanization to be achieved at lower temperatures, thereby suppressing byproduct formation and improving safety. Hasell also reported alternative initiation methods that remove the need for heating including mechanochemical inverse vulcanization and photoinduced inverse vulcanization. Regarding control of sulfur rank and structure, Pyun and associates have recently reported alternative sulfur-derived monomers such as sulfur monochloride (S2Cl2) that can react with alkene-containing comonomers through a step-growth mechanism, providing polymers with disulfide linkages throughout the backbone. In this study, we report a new and complementary electrochemical polymerization method that provides poly(trisulfides) with precise control of sulfur rank (Fig. ). The polymerization is rapid at room temperature. The key monomers, derived from elemental sulfur and norbornene derivatives, contain a cyclic trisulfide that can be triggered to undergo ringopening polymerization upon electrochemical reduction. Because the stereochemistry of the C-S bond is fixed before polymerization, this aspect of the final polymer structure is also controlled.