Stereocontrolled acyclic diene metathesis polymerization.

Autor: Hsu TW; Department of Chemistry, Texas A&M University, College Station, TX, USA., Kempel SJ; Department of Chemistry, Texas A&M University, College Station, TX, USA., Felix Thayne AP; Department of Chemistry, Texas A&M University, College Station, TX, USA., Michaudel Q; Department of Chemistry, Texas A&M University, College Station, TX, USA. quentin.michaudel@chem.tamu.edu.; Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA. quentin.michaudel@chem.tamu.edu.
Jazyk: angličtina
Zdroj: Nature chemistry [Nat Chem] 2023 Jan; Vol. 15 (1), pp. 14-20. Date of Electronic Publication: 2022 Oct 24.
DOI: 10.1038/s41557-022-01060-6
Abstrakt: The cis/trans geometry of olefins is known to dramatically influence the thermal and mechanical properties of polyalkenamers. Yet, polymerization methods that efficiently control this parameter are scarce. Here we report the development of a stereoretentive acyclic diene metathesis polymerization that uses the reactivity of dithiolate Ru carbenes combined with cis monomers. These Ru catalysts exhibit exquisite retention of the cis geometry and tolerate many polar functional groups, enabling the synthesis of all-cis polyesters, polycarbonates, polyethers and polysulfites. The stereoretentive acyclic diene metathesis polymerization is also characterized by low catalyst loadings and tolerance towards trans impurities in the monomer batch, which should facilitate large-scale implementation. Modulation of the reaction temperature and time leads to an erosion of stereoretention, permitting a stereocontrolled synthesis of polyalkenamers with predictable cis:trans ratios. The impact of the stereochemistry of the repeating alkenes on the thermal properties is clearly demonstrated through differential scanning calorimetry and thermogravimetric analysis.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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