Question

In ziegler natta polymerisation the active species is

Answer 1

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The scandium hydride complex [(Cp* SiNR)(PMe3) Sc (~-H)] 2,(1)((Cp* SiNR)=((q5-C5Me4) SiMe2 (q1-NCMe3)}) is prepared by hydrogenation of (Cp* SiNR) ScCH (SiMe3) 2 in the presence of trimethylphosphine. The hydride complex is a catalyst precursor for the polymerization of a-olefins, yielding atactic products of low molecular weight (M,= 3000-7000). GC/MS analysis of volatile, oligomeric products revealed that all scandium centers are active during the polymerization. Selectivity for head-to-tail insertion is high (> 99%) and …


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