In this study, we found that acid-catalyzed ring-opening polymerization (ROP) of γ-butyrolactone, which showed difficulty progressing in general ROP, took place under high-pressure conditions. The structure of the product was confirmed by the 1H NMR spectrum to be poly(γ-butyrolactone). Furthermore, the Mn values increased with increasing monomer conversions.
A metal-free photoredox-catalyzed hydrodefluorination of fluoroarenes was achieved by using N,N,N',N'tetramethyl-para-phenylenediamine (1) as a strong photoreduction catalyst. This reaction was applicable not only to electron-rich monofluoroarenes but also to polyfluoroarenes to afford non-fluorinated arenes. The experimental mechanistic studies indicated that the amide solvent NMP plays an important role for regeneration of the photocatalyst, enabling additive-free photoreduction catalysis.
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