An end-π-allylnickel macroinitiator (3) was prepared by the reaction of poly(ethylene glycol) allenyl methyl ether with an excess amount (5 equiv) of [(π-allyl)NiOCOCF3]2 (1) in the presence of PPh3 ([PPh3]/[1] = 1). The resulting macroinitiator was used as an initiator for the polymerization of 1-phenylethyl isonitrile (4a) to give a block copolymer [poly(ethylene glycol)-block-poly(4a)]. The molecular weight and composition of the block copolymers were controlled by the molecular weight of 3 and the ratio of 4a to 3.
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Taguchi et al. (2001) studied this question.
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