Preparation of Chalcogen-Containing Polymers through Ring-Opening Reaction of Glycidyl Scaffolds
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Chalcogen-containing polymers are prepared through the ring-opening reaction of glycidyl scaffolds. The three-membered ring strain of the epoxide unit makes it susceptible to nucleophiles like sulfur and selenium compounds. These reactions carried out under ambient conditions, are fast, efficient, and regioselective, thus termed the 'click' reaction. However, free thiol or selenol molecules dimerize oxidatively to form inactive disulfide/diselenide bonds under basic and ambient conditions. To avoid this problem, a reducing agent can regenerate active chalcogenols by breaking these bonds. In this concept, we have designed a novel ring-opening reaction using disulfide/diselenide as precursors and sodium borohydride (NaBH4) as a reducing agent. NaBH4 converts to active nucleophiles (sodium thiolate/selenolate) without a base catalyst, initiating the reactions. In this presentation, we will discuss our efforts in designing and developing chalcogen-containing polymers.