Scandium-Catalyzed Syndiospecific Chain-Transfer Polymerization of Styrene Using Anisoles as a Chain Transfer Agent

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• 作者：Atsushi Yamamoto ; Masayoshi Nishiura ; Juzo Oyamada ; Hiroyuki Koshino ; Zhaomin Hou
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：April 12, 2016
• 年：2016
• 卷：49
• 期：7
• 页码：2458-2466
• 全文大小：507K
• 年卷期：0
• ISSN：1520-5835

文摘

The polymerization of styrene in the presence of various anisole derivatives has been examined by using the half-sandwich scandium diaminobenzyl complex (C₅Me₄SiMe₃)Sc(CH₂C₆H₄NMe₂-o)₂ with borate [Ph₃C][B(C₆F₅)₄]. The syndiospecific chain transfer polymerization of styrene proceeded efficiently via the ortho-C–H bond activation of anisoles, affording the corresponding end-ortho-anisyl-functionalized syndiotactic polystyrenes. The molecular weight of the resulting polymers could be controlled in a wide range by changing the styrene/anisole feeding ratio. Propenyl and halogen (F, Cl, Br, and I) substituents on the anisole compounds are compatible with the present catalyst system, thus enabling easy introduction of unsaturated C═C double bond or halogen moieties together with the anisole functionality to the chain end of syndiotactic polystyrene.