Regioselectivity of the insertion of propene with achiral Pd(ii) catalysts to highly isotactic poly[1-oxo-2-methylpropane-1,3-diyl]. Is the syndiotactic structure accessible?
作者:Barbara Sesto、Giambattista Consiglio
DOI:10.1039/b002058n
日期:——
Achiral cationic palladium catalysts, modified with
1,2-bis(diarylphosphinomethyl)benzene ligands with different electronic
properties, can efficiently produce poly(propene-alt-CO) with
essentially complete regioregularity and high isotacticity, depending on
the aryl substituent; the stereochemistry of the copolymers obtained is
barely, if at all, influenced by the regiochemistry of the olefin
insertion.
用具有不同电子特性的 1,2-双(二芳基膦甲基)苯配体修饰的无手性阳离子钯催化剂可以高效地生产出聚(丙烯-alt-CO),根据芳基取代基的不同,聚(丙烯-alt-CO)基本上具有完全的区域规则性和高度的同构性;所获得的共聚物的立体化学几乎不受烯烃插入的区域化学的影响。