Abstract
Addition polynorbornenes are the promising class of polymers for macromolecular design of various engineering polymers. This work has shown for the first time the fundamental possibility to obtain addition polynorbornenes in the presence of catalytic systems based on Pd(0) complexes activated by organic cocatalysts (aryl halides). Addition polymerization of norbornene has been studied in the presence of different cocatalysts, which allowed one to assess the effect of cocatalyst nature on the activity of the catalytic system.
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A glass 4-mL vial was charged under inert atmosphere with 0.0120 g of Pd(dba)2 (0.02 mmol, 1 eq) and 0.020 g of iodobenzene (0.1 mmol, 5 eq). After stirring for 1–2 min, 0.263 g of 76% solution (2.1 mmol) of norbornene in anhydrous toluene was added to the mixture. The reaction mixture was stirred for 24 h. The polymer was precipitated into ethanol. The coagulated polymer was separated by filtration, washed with ethanol, and dried under reduced pressure. Next, the polymer was twice dissolved in toluene followed by precipitation into ethanol and dried under reduced pressure at 40°С until constant weight. Yield 36%. 1H NMR (CDCl3, δ, ppm): 2.35–0.78 (m, 10 H).
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Funding
This work was supported by the Presidential Grant Program (project no. MD–1818.2020.3). The synthesis of initial Pd complexes was performed within the State Program of Topchiev Institute of Petrochemical Synthesis, RAS.
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Translated by I. Kudryavtsev
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Karpov, G.O., Bermeshev, M.V. New Catalytic Systems Based on Pd(0) Complexes for Addition Polymerization of Norbornene. Dokl Chem 495, 195–198 (2020). https://doi.org/10.1134/S0012500820120046
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DOI: https://doi.org/10.1134/S0012500820120046