Cationic Triarylchlorostibonium Lewis Acids.

Cationic Triarylchlorostibonium Lewis Acids.
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DOI:
10.1021/acs.organomet.2c00426
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发表时间:
2023-03-13
期刊:
影响因子:
2.8
通讯作者:
Benjamin, Sophie L.
Benjamin, Sophie L.
中科院分区:
化学2区
文献类型:
--
作者:
Coughlin, Omar;Kraemer, Tobias;Benjamin, Sophie L.

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有机尼古丁基阳离子作为高效、可调的主基Lewis酸催化剂具有广阔的应用前景。报道了一系列弱配位的三芳基氯钛盐[Ar3SbCl][B(C6F5)4](Ar=Ph,3-FC6H4,4-FC6H4,3,5-F2C6H3,2,4,6-F3C6H2)的合成、固相结构和反应活性。每种离子中的阳离子都采用锑的四面体配位环境,与阴离子几乎完全分离。结构、计算和反应活性研究表明,[Ar3SbCl]+的Lewis酸性一般随着Ar取代基氟化程度的增加而增加,对氟化作用产生二次猝灭效应。在Et3SiH存在下,[Ar3SbCl]+被还原为Ar3Sb,并对该反应的机理进行了计算模拟。初步研究表明,它们是1,1-二苯乙烯二聚和苯的Friedel-Craft烷基化反应的有效催化剂。
Organopnictogen cations show promise as powerful, tunable main-group Lewis acid catalysts. The synthesis, solid-state structures, and reactivity of a series of weakly coordinated triarylchlorostibonium salts [Ar3SbCl][B(C6F5)4] (Ar = Ph, 3-FC6H4, 4-FC6H4, 3,5-F2C6H3, 2,4,6-F3C6H2) are reported. The cation in each adopts a tetrahedral coordination environment of antimony, with near complete separation from the anion. Structural, computational, and reactivity studies reveal that the Lewis acidity of [Ar3SbCl]+ generally increases with increased fluorination of the Ar substituents, with a secondary quenching effect from para fluorination. [Ar3SbCl]+ is reduced to Ar3Sb in the presence of Et3SiH, and the mechanism of this reaction has been modeled computationally. Preliminary studies demonstrate that they are useful catalysts for the dimerization of 1,1-diphenylethylene and the Friedel–Crafts alkylation of benzene.
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