Chain‐Shuttling Polymerization at Two Different Scandium Sites: Regio‐ and Stereospecific “One‐Pot” Block Copolymerization of Styrene, Isoprene, and Butadiene | Zendy

Pan Li | Zendy; Zhang Kunyu | Zendy; Nishiura Masayoshi | Zendy; Hou Zhaomin | Zendy

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Chain‐Shuttling Polymerization at Two Different Scandium Sites: Regio‐ and Stereospecific “One‐Pot” Block Copolymerization of Styrene, Isoprene, and Butadiene

Author(s) -

Pan Li,

Zhang Kunyu,

Nishiura Masayoshi,

Hou Zhaomin

Publication year - 2011

Publication title -

angewandte chemie international edition

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.831

H-Index - 550

eISSN - 1521-3773

pISSN - 1433-7851

DOI - 10.1002/anie.201104011

Subject(s) - isoprene , copolymer , polymerization , styrene , stereospecificity , polystyrene , polymer chemistry , styrene butadiene , chemistry , polymer science , materials science , organic chemistry , catalysis , polymer

To each his own: Copolymerization of styrene and isoprene by catalysts Sc1 (syndiospecific for styrene) and Sc2 ( cis ‐1,4‐specific for isoprene) with a chain‐shuttling agent i Bu 3 Al gives block copolymers of syndiotactic polystyrene ( s PS) and cis ‐1,4‐polyisoprene (PIP). Replacement of Sc2 with Sc3 (high 3,4‐selectivity for isoprene polymerization) gives selectively copolymers having s PS and 3,4‐PIP blocks.

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