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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