The Non‐Ancillary Nature of Trimethylsilylamide Substituents in Boranes and Borinium Cations
作者:Christopher J. Major、Zheng‐Wang Qu、Stefan Grimme、Douglas W. Stephan
DOI:10.1002/chem.202200698
日期:2022.5.11
boranes (R(Me3 Si)N)2 BF (R=Me3 Si 1, tBu 2, C6 F5 3, o-tol 4, Mes 5, Dipp 6) and borinium salts (R(Me3 Si)N)2 B][B(C6 F5 )4 ] (R=Me3 Si 7, tBu 8) are prepared and fully characterized. Compound 7 is shown to react with phosphines to generate [R3 PSiMe3 ]+ and [R3 PH]+ (R=Me, tBu). Efforts to generate related borinium cations via fluoride abstraction from (R(Me3 Si)N)2 BF (R=C6 F5 3, o-tol 4, Mes 5) gave
已知的硼烷 (R(Me3 Si)N)2 BF (R=Me3 Si 1, tBu 2, C6 F5 3, o-tol 4, Mes 5, Dipp 6) 和硼鎓盐 (R(Me3 Si)N)2 B][B(C6 F5 )4 ] (R=Me3 Si 7, tBu 8) 已制备并充分表征。化合物 7 与膦反应生成 [R3 PSiMe3 ]+ 和 [R3 PH]+ (R=Me, tBu)。通过从 (R(Me3 Si)N)2 BF (R=C6 F5 3, o-tol 4, Mes 5) 中提取氟化物生成相关硼鎓阳离子的努力产生了复杂的混合物,表明存在多种反应途径。然而,对于 R=Dipp 6,物种 [(μ-F)(SiMe2 N(Dipp))2 BMe][B(C6 F5 )4 ] 被分离为主要产物,表明从硅中提取甲基和 F/Me 交换关于硼。这些观察结果与最先进的 DFT 机理研究一起表明,三甲基甲硅烷基