reported. Treatment of these complexes with methylaluminoxane (MAO) leads to highly active butadiene polymerization catalysts; polymers having different microstructure have been obtained depending on the type of phosphine ligand bonded to the cobalt atom. An interpretation for this particular behavior, based on the 1,3-dienes polymerization mechanism previously proposed, is given.
一些
钴(II)膦配合物(CoCl 2(PEt 3)2,CoCl 2(P n Pr 3)2,CoCl 2(PCy 2 H)2, CoCl 2(P t Bu 2 H)2,CoCl 2(P t Bu 2 Me)2,CoCl 2(PCyp 3)2,CoCl 2(PCy 3)2; 描述了Et =乙基,n Pr = 正丙基,Cy =环己基,t Bu = 叔丁基,Cyp =环戊基)。报道了CoCl 2(PCy 3)2和CoCl 2(PCy 2 H)2的X射线衍射研究。用甲基铝氧烷(MAO)处理这些配合物会产生高活性的
丁二烯聚合催化剂。根据键合到
钴原子上的
膦配体的类型,已经获得了具有不同微观结构的聚合物。基于先前提出的1,3-二烯聚合机理,给出了对该特定行为的解释。