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Ironing rubber: Iminopyridine‐based FeCl2 catalysts catalyze the polymerization of 1,3‐dienes and provide stereoselective access to elastomers such as polyisoprenes, polymyrcenes, and polyfarnesenes. The choice of ligand determines the double‐bond geometry in the polymer repeating unit, which can be varied from trans/cis >99:1 to <1:99 (see scheme).
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