Highly selective molybdenum ONO pincer complex initiates the living ring-opening metathesis polymerization of strained alkynes with exceptionally low polydispersity indices.

Highly selective molybdenum ONO pincer complex initiates the living ring-opening metathesis polymerization of strained alkynes with exceptionally low polydispersity indices.
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DOI:
10.1021/ja510919v
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发表时间:
2015-01-21
影响因子:
15
通讯作者:
Fischer, Felix R.
Fischer, Felix R.
中科院分区:
化学1区
文献类型:
--
作者:
Bellone, Donatela E.;Bours, Justin;Menke, Elisabeth H.;Fischer, Felix R.

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假八面体钼亚苄基配合物[TolC Mo(ONO)(OR)]·KOR(R = CCH 3(CF 3)2)1具有稳定的ONO钳形配体,在T > 60 °C下引发应变二苯并环辛炔的受控活性聚合,得到具有异常低的多分散性(PDI <1.02)的高分子量聚合物。动力学分析表明,增长的聚合物链连接到增长催化剂有效地限制相对于引发速率(kp/ki = 10-3)的增长速率。KOCCH 3(CF 3)2与增长催化剂的可逆配位防止了不期望的链终止和链转移过程。与1的开环炔易位聚合具有活性聚合的所有特征,并且第一次能够通过ROAMP控制合成两亲性嵌段共聚物。
The pseudo-octahedral molybdenum benzylidyne complex [TolC≡Mo(ONO)(OR)]·KOR (R = CCH3(CF3)2) 1, featuring a stabilizing ONO pincer ligand, initiates the controlled living polymerization of strained dibenzocyclooctynes at T > 60 °C to give high molecular weight polymers with exceptionally low polydispersities (PDI ∼ 1.02). Kinetic analyses reveal that the growing polymer chain attached to the propagating catalyst efficiently limits the rate of propagation with respect to the rate of initiation (kp/ki ∼ 10–3). The reversible coordination of KOCCH3(CF3)2 to the propagating catalyst prevents undesired chain-termination and -transfer processes. The ring-opening alkyne metathesis polymerization with 1 has all the characteristics of a living polymerization and enables, for the first time, the controlled synthesis of amphiphilic block copolymers via ROAMP.
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