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The synthesis of very well defined four‐ and six‐branched polystyrene has been carried out. Anionic polymerization initiated by butyllithium in benzene–tetrahydrofuran medium gave single chains of narrow distribution. Coupling this living polystyryllithium with bis(trichlorosilyl)ethane gave a maximum of four branches. Coupling with the cyclic trimer of phosphonitrilic chloride gave a maximum of six branches. The reaction procedures have been discussed and mechanisms suggested for some of the reactions.
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Gervasi et al. (1966) studied this question.
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