Well‐defined poly(ethylene oxide)s with low polydispersities are formed in the anionic polymerization of ethylene oxide with an alkyllithium/phosphazene base initiator system. The base can be regarded as a cryptand for Li+ ions. The equilibrium between complexed alkoxide ion pairs and reactive free anions is thus shifted.
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Eßwein et al. (1996) studied this question.
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