Lewis Acidity of Bis(perfluorocatecholato)silane: Aldehyde Hydrosilylation Catalyzed by a Neutral Silicon Compound.

Lewis Acidity of Bis(perfluorocatecholato)silane: Aldehyde Hydrosilylation Catalyzed by a Neutral Silicon Compound.
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二氧化硅的刘易斯酸度:醛的醛氢硅烷基由中性硅化合物催化。

DOI:
10.1021/jacs.5b02807
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发表时间:
2015-04-29
影响因子:
15
通讯作者:
Tilley TD
Tilley TD
中科院分区:
化学1区
文献类型:
--
作者:
Liberman-Martin AL;Bergman RG;Tilley TD

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制备了双(全氟儿茶酚)硅烷 Si(catF)2,并用氟化物、三乙基氧化膦和 N,N'-二异丙基苯甲酰胺证明了与路易斯碱的化学计量结合。 Si(catF)2 的强路易斯酸性是通过与醛的催化氢化硅化反应和甲硅烷基氰化反应得出的。使用光学活性硅烷底物 R-(+)-甲基(1-萘基)苯基硅烷进行硅氢化反应的机理研究,以硅上的主要立体化学保留进行,这与羰基活化途径一致。对映体特异性取决于溶剂和盐的影响,增加溶剂极性或添加 NBu4BArF4 会导致对映体比率降低。介质效应与离子机制一致,其中氢化物转移发生在硅-氧键形成之前。
Bis(perfluorocatecholato)silane Si(catF)2 was prepared, and stoichiometric binding to Lewis bases was demonstrated with fluoride, triethylphosphine oxide, and N,N′-diisopropylbenzamide. The potent Lewis acidity of Si(catF)2 was suggested from catalytic hydrosilation and silylcyanation reactions with aldehydes. Mechanistic studies of hydrosilation using an optically active silane substrate, R-(+)-methyl(1-napthyl)phenylsilane, proceeded with predominant stereochemical retention at silicon, consistent with a carbonyl activation pathway. The enantiospecificity was dependent on solvent and salt effects, with increasing solvent polarity or addition of NBu4BArF4 leading to a diminished enantiomeric ratio. The medium effects are consistent with an ionic mechanism, wherein hydride transfer occurs prior to silicon–oxygen bond formation.
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