A boron-containing compound of the formula (1):
 wherein R¹ through R⁶ are substituents as defined in the body of the specification, Y is a hydrocarbon group, i = 0 or 1, and X⁺ is a univalent cation; and a polymer of the compound (1). The polymer of the compound (1) is used in combination with a metalocene compound, as a catalyst system for polymerization of an olefin.
                            一种含
硼化合物,其
化学式为(1):其中R¹到R⁶是规范中定义的取代基,Y是一个碳氢基团,i=0或1,X⁺是一个一价阳离子;以及该化合物(1)的聚合物。该化合物(1)的聚合物与一个
铁茂化合物结合使用,作为一种催化剂体系,用于烯烃的聚合。