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Please login or sign up for a free trial to access the full content. Ring-Opening Metathesis Polymerization for Synthesis of Branched Polymer Architectures

DOI: 10.1055/sos-SD-224-00037

Liu, J.; Johnson, J. A.Science of Synthesis: N-Heterocyclic Carbenes in Catalytic Organic Synthesis, (20162107.

The remarkable activity of complexes 5 and 6 has enabled the synthesis of complex polymer architectures via polymerization of highly functionalized monomers. For example, bottlebrush polymers with 100% side-chain functionalization can be readily prepared via graft-through ring-opening metathesis polymerization (ROMP) of cyclic-alkene-terminated macromonomers. Under the appropriate conditions, graft-through ROMP reactions can achieve quantitative macromonomer conversions, high molar masses (>106 Da), and low dispersities (Ð). In contrast, complementary graft-to and graft-from methods can lead to incomplete grafting and low or unknown conversion, respectively.[‌66‌] Macromonomers for graft-through ROMP can be synthesized via a variety of different living polymerization techniques, which opens the door to bottlebrush polymers with wide functional diversity.[‌66‌‌71‌]

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Me(MMM)8888-eeeee-ee-Me(MeMM)8888 8.88–8.88 Me 8 MMM, ee 888 888 8.88 88 [‌88‌]
Me(MMM)8888-eeeeee-ee-Me(MeMM)8888 8.88–8.88 Me 8 MMM, ee 8 888 888 8.88 88 [‌88‌]
Me(MMM)8888 8.8 M 8 MM8Me8, ee, 8 e 888 888 8.88e >88 [‌88‌]
Me(MM88-eeeee-ee-MMM88-eeeee-ee-MeMM88)e 88.8 ee · eM−8 8 MM8Me8, ee, 8 e 8 888 888 8.88e 88 [‌88‌]

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