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Acid is a catalyst for making and breaking poly(disulfide)s. In their Research Article (e202215329), Da‐Hui Qu et al. report that the disulfide bonds of 1,2‐dithiolanes can be activated by acid protonation, enabling a robust and protection‐free methodology to prepare long polymers with chemical recyclability.
Poly(1,2‐dithiolane)s are a family of intrinsically recyclable polymers due to their dynamic covalent disulfide linkages. Despite the common use of thiolate‐initiated anionic ring‐opening polymerization (ROP) under basic condition, cationic ROP is still not exploited. Here we report that disulfide bond can act as a proton acceptor, being protonated by acids to form sulfonium cations, which can efficiently...
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