Living polymers: Iron(III) complexes with phosphorus-containing ligands are efficient catalysts for atom transfer radical polymerization in the absence of any radical initiator or reducing agent. The polymers produced have good molecular weights and narrow polydispersities as determined by gel permeation chromatography (see scheme). The controlled nature of the FeBr3/dppp system was confirmed by a chain-extension experiment. Mn,GPC in [g mol−1].
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