Polymerization of aryl cyclic sulfonium

SCHMIDT Polymerization of Aryl Cyclic Sulfonium ZtoUterions 319... 

In the copolymerization with PPL, only route a has been considered by Saegusa, and transfer was not taken into account. Macrocyclization by end-to-end closure is another possibility, however, these macrocycles cannot easily be isolated and studied. The presence of macrocycles may be corroborated by comparison of DPn determined from end-groups with those measured by other methods e.g. GPC, osmometry, etc., i.e. when cyclic and linear molecules are counted separately. Such macrocycles were indeed observed by Schmidt in the polymerization of aryl sulfonium zwitterion 86) ... 

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