| 摘要 |
In a process for the transition-metal-catalyzed preparation of polymers having a syndiotactic or predominantly syndiotactic structure from vinylaromatic monomers and a process for preparing block copolymers from vinylaromatic monomers and olefinically unsaturated polar monomers, use is made of transition metal compounds of the formula (I)where the substituents and indices have the following meanings:M is scandium, yttrium, lanthanum or a lanthanide metal,R''' is mu-C3-C20-alkyl,L is a low molecular weight organic compound having Lewis basicity, where n=1 or 0 and at least one n in (I) is 0,m is 1 or 2.
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