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The cationic polymerization of 1,3,6,9‐tetraoxacycloundecane (3) in CH2Cl2 at 0°C gives polymers with a regular OCH2(OC2H4)3 sequence. High polymers are obtained only after the formation of a considerable amount of oligomers. The oligomers up to the octamer ((C7H14O4)x; x=2–8) have been isolated individually and indentified by means of HP‐GPC and NMR as homologues of the cyclic monomer. The equilibrium concentrations of monomer and dimer are the same when the monomer and the dimer are polymerized and when the high polymer is depolymerized.
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Rentsch et al. (1977) studied this question.
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