Synthesis of N-Heterocyclic Carbene Stabilized Catecholatoborenium Cations by Ligand Substitution
Synthesis of N-Heterocyclic Carbene Stabilized Catecholatoborenium Cations by Ligand Substitution
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DOI：
10.1021/om500434r
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发表时间：
2014-08-25
期刊：
影响因子：
2.8
通讯作者：
Vidovic, Dragoslav
中科院分区：
文献类型：
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作者：
Dinh Cao Huan Do;Muthaiah, Senthilkumar;Vidovic, Dragoslav
配体取代并不是制备不同Borenium阳离子的常见方法。这项工作表明，几种NHC稳定的二氯硼阳离子[NHC中心点BCl 2] [X]的氯配体（NHC =（R ′ C）（2）（NR）（2）C; 1，R = Pr-1，R ′ = H; 2，R = Pr-1，R ′ = Me; 3，R = Bu-t，R ′ = H; X = AlCl 4，B（3，5-Cl-2-C6 H3）（4））可以被邻苯二酚部分取代以产生[NHC中心点Bcat][X]。根据单晶X-射线分析，这种特殊的配体交换增强了目标硼酸盐相对于二氯前体的刘易斯酸性。
Ligand substitution is not a common procedure for the preparation of different borenium cations. This work demonstrates that the chloride ligands of several NHC-stabilized dichloroborenium cations [NHC center dot BCl2] [X] (NHC = (R'C)(2)(NR)(2)C; 1, R = Pr-i, R' = H; 2, R = Pr-i, R' = Me; 3, R = Bu-t, R' = H; X = AlCl4, B(3,5-Cl-2-C6H3)(4)) could be replaced with a catecholato moiety to produce [NHC center dot Bcat][X]. According to single-crystal X-ray analyses this particular ligand exchange enhanced the Lewis acidity of the target borocations with respect to the dichloro precursors.