(C6F5)3, Cp*TiMe(OC6F5)(μ-Me)B(C6F5)3, and Cp*TiMeCl(μ-Me)B(C6F5)3, respectively, which are similar to the known Cp*TiMe2(μ-Me)B(C6F5)3. All four μ-Me compounds behave as sources of the highly electrophilic species [Cp*TiMeE]+ (E = Me, Cl, C6F5, OC6F5) when treated with the borane, the last three being chiral, and all four systems exhibit catalytic activities for the polymerization of ethylene to
化合物的CP *时间2 ç 6 ˚F 5中,CP *时间2 OC 6 ˚F 5和CP *时间2 Cl(上的CP * =η 5 -C 5我5)与
硼烷乙反应(C 6 ˚F 5)3形成热不稳定的手性络合物CP * TiMe(C 6 F 5)(μ-Me)B(C 6 F 5)3,CP * TiMe(OC 6 F 5)(μ-Me)B(C 6 F 5)3和CP * TiMeCl(μ-Me)B(C6 F 5)3分别类似于已知的CP * TiMe 2(μ-Me)B(C 6 F 5)3。所有四种μ-Me化合物均表现为高度亲电物种[CP * TiMeE] +(E = Me,Cl,C 6 F 5,OC 6 F 5当用
硼烷处理时,最后三个是手性的,并且所有四个体系都表现出催化活性,使
乙烯聚合成高分子量聚
乙烯。尽管三种化合物在
钛上具有手性,但所有这些化合物的
丙烯聚合都会导致形成无规立构的弹性聚
丙烯。形成的
丙烯聚合物的NMR分析表明,引发过程涉及将1