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2.1.5.1.4 Ring-Opening Metathesis Polymerization with Modified N-Heterocyclic Carbenes

DOI: 10.1055/sos-SD-224-00037

Liu, J.; Johnson, J. A.Science of Synthesis: N-Heterocyclic Carbenes in Catalytic Organic Synthesis, (20162113.

Almost all of the examples in the previous sections rely on ruthenium complexes that feature the same N-heterocyclic carbene ligand [1,3-bis(mesityl)-4,5-dihydroimidazol-2-ylidene, SIMes]. The development of ruthenium complexes with alternative N-heterocyclic carbenes has enabled stereoselective ROMP, ROMP in aqueous conditions, ROMP on solid-supports, and ROMP synthesis of cyclic polymers.[‌8‌,‌86‌] Furthermore, ROMP from a ruthenium–alkylidene bound via an N-heterocyclic carbene to a gold substrate has enabled the synthesis of surface-tethered ROMP polymers where the polymers are connected to the gold surface through N-heterocyclic carbenes. Thus, modified N-heterocyclic carbenes have expanded the scope of possibilities in alkene metathesis polymerization.

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