PYRIDLYAMIDOHAFNIUM CATALYST PRECURSORS, ACTIVE SPECIES FROM THIS AND USES THEREOF TO POLYMERIZE ALKENES

摘要

Cs-Symmetric pyridylamidohafhium catalyst precursors and active species based thereon are described. The active species are used for living polymerization of C<SUB>2</SUB>-C<SUB>20</SUB> alkenes and provide highly isotactic polypropylene and are useful to provide multi-block copolymer with end blocks of isotactic polypropylene or isotactic poly(4-methyl-1-pentene).