Catalyst Deactivation Processes during 1-Hexene Polymerization
Catalyst Deactivation Processes during 1-Hexene Polymerization
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DOI：
10.26434/chemrxiv.12081768
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发表时间：
2020-04
期刊：
影响因子：
12.9
通讯作者：
Anuj Joshi;Harmen S. Zijlstra;S. Collins;J. McIndoe
中科院分区：
文献类型：
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作者：
Anuj Joshi;Harmen S. Zijlstra;S. Collins;J. McIndoe
为了更好地了解1-己烯聚合反应中催化剂失活的复杂性，用电喷雾电离质谱仪对催化剂[Cp_2Zr(μ-Me)_2AlMe_2]+[B(C_6F_5)_4]−(1)进行了研究。使用离线、在线和流动的方法，我们观察到π-烯丙基的锆物种在溶液中是不稳定的，而以前没有观察到的二甲基丙烷络合物更稳定。二甲基丙烷络合物能抵抗1-己烯的进一步加成，它们的形成代表了催化剂失活的一条新途径。
The catalyst [Cp2Zr(μ-Me)2AlMe2]+[B(C6F5)4]− (1) has been studied by electrospray ionisation mass spectrometry (ESI-MS) in order to better understand the complexities of catalyst deactivation in the polymerisation of 1-hexene. Using offline, online and flow-based methods, we observe that zirconium π-allyl species are unstable in solution and previously unobserved dimethylalane complexes are more stable. The dimethylalane complexes are resistant to further 1-hexene additions and their formation represent a new pathway for catalyst deactivation.