Investigating the effects of bulky allylic substituents on the regioregularity and thermodynamics of ROMP on cyclopentene

Investigating the effects of bulky allylic substituents on the regioregularity and thermodynamics of ROMP on cyclopentene
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研究大烯丙基取代基对环戊烯 ROMP 的区域规整性和热力学的影响

DOI:
10.1016/j.eurpolymj.2019.109251
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发表时间:
2019
影响因子:
6
通讯作者:
Kennemur, Justin G.
Kennemur, Justin G.
中科院分区:
化学2区
文献类型:
--
作者:
Guillory, Gina A.;Kennemur, Justin G.

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研究了在不同温度下,在Hoveyda-GRubbs第二代催化剂上,平衡ROMP热力学与烯丙基三烷基硅氧基取代环戊烯的区域规则插入之间的相互作用。一般来说,体积较大的取代基降低了单体转化率,增加了区域规则插入。然而,与环应变(ΔHp)相比,聚合熵(ΔSp)似乎也在ROMP热力学中发挥着重要作用,环应变通常是低应变单体转化效率的焦点参数。通过这种分析,可以确定“金发姑娘”单体(即提供单体转化率(在−10 °C时转化率为56%)和区域规整度(97%HT插入率)的最佳折衷)为3-(叔丁基二甲基硅氧基)环戊烯的单体,这是以前从未探索或报道过的。由于这项研究,该单体现在已被确定为全同立构聚戊二烯研究进展的理想选择。
The interplay between equilibrium ROMP thermodynamics and the regioregular insertion of allylic trialkylsiloxy-substituted cyclopentenes during propagation with Hoveyda-Grubbs 2nd generation catalyst at varying temperatures is investigated. In general, bulkier substituents reduce monomer conversion and increase regioregular insertion. However, polymerization entropy (ΔSp) also appears to play an important role on ROMP thermodynamics when compared to ring strain (ΔHp) which is typically the parameter of focus for the efficacy of low-strain monomer conversion. This analysis has allowed for the determination of a “Goldilocks” monomer (i.e. one that provides the best compromise of monomer conversion (56% conversion at −10 °C) and regioregularity (97% HT insertion) to be 3-(tert-butyldimethylsiloxy)cyclopentene which has never before been explored or reported. Due to this study, this monomer has now been identified as the ideal choice for isotactic polypentenamer studies moving forward.
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