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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >DFT investigation of the 'quasi-living' propene polymerisation withCp~*TiMe_3/B(C_6F_5)_3: the 'naked cation' approach
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DFT investigation of the 'quasi-living' propene polymerisation withCp~*TiMe_3/B(C_6F_5)_3: the 'naked cation' approach

机译:DFT研究使用Cp〜* TiMe_3 / B(C_6F_5)_3的“准活性”丙烯聚合:“裸阳离子”方法

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Some time ago we reported the quasi-living polymerization of propene with the catalytic mixture ofCp~*TiMe_3 and B(C_6F_5)_3 (Cp~* = C_5Me_5). Surprisingly, this mixture is extremely sensitive towards thenaiure of the anion and the presence of aluminium alkyl. This intriguing observation led us to theattempt to unearth the underlying reaction mechanism using a computational approach. In thiscommunication, we are reporting the first results with the 'naked cation' approach. We obtainedevidence, that the 1,2 insertion is the predominant reaction pathway. Whereas initial 1,2 and 2,1 insertion barriers are comparable, consequent second insertion is more discriminating between the two.Although we obtained evidence for the formation of β-H agostic bonds, we found that β-H eliminationis a rare event due to the rather high activation barrier. We can conclude that the quasi-livingpolymerisation is at least partly an intrinsic property of the cation.
机译:前段时间,我们报道了丙烯与Cp〜* TiMe_3和B(C_6F_5)_3(Cp〜* = C_5Me_5)的催化混合物的准活性聚合。令人惊讶地,该混合物对阴离子的存在和烷基铝的存在极其敏感。这种有趣的观察导致我们试图使用一种计算方法来发掘潜在的反应机制。在本次交流中,我们报告了“裸阳离子”方法的初步结果。我们得到的证据表明,1,2插入是主要的反应途径。尽管最初的1,2和2,1插入壁垒是可比的,但随后的第二次插入在两者之间更具区别。尽管我们获得了形成β-H原子键的证据,但我们发现,由于以下原因,β-H消除是罕见的事件较高的激活障碍。我们可以得出结论,准活性聚合至少部分是阳离子的固有性质。

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