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Pentafluorosulfanyl Substituents in Polymerization Catalysis
Journal of the American Chemical Society ( IF 15.0 ) Pub Date : 2017-09-18 , DOI: 10.1021/jacs.7b06745
Philip Kenyon 1 , Stefan Mecking 1
Affiliation  

Highly electron-withdrawing pentafluorosulfanyl groups were probed as substituents in an organometallic catalyst. In Ni(II) salicylaldiminato complexes as an example case, these highly electron-withdrawing substituents allow for polymerization of ethylene to higher molecular weights with reduced branching due to significant reductions in β-hydrogen elimination. Combined with the excellent functional group tolerance of neutral Ni(II) complexes, this suppression of β-hydrogen elimination allows for the direct polymerization of ethylene in water to nanocrystal dispersions of disentangled, ultrahigh-molecular-weight linear polyethylene.

中文翻译:

聚合催化中的五氟硫烷基取代基

高度吸电子的五氟硫烷基被探测为有机金属催化剂中的取代基。以 Ni(II) 水杨醛基配合物为例,这些高度吸电子的取代基允许乙烯聚合成更高的分子量,由于 β-氢消除显着减少,支化减少。结合中性 Ni(II) 配合物优异的官能团耐受性,这种 β-氢消除的抑制允许乙烯在水中直接聚合成解缠结的超高分子量线性聚乙烯的纳米晶体分散体。
更新日期:2017-09-18
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