作者:Rita Meyer、Karla Werner、Thomas Müller
DOI:10.1002/1521-3765(20020301)8:5<1163::aid-chem1163>3.0.co;2-m
日期:2002.3.1
of the silyl substituents in arenium ions 1. The bissilylated benzenium ion 1a is more stable than the parent benzenium ion (C(6)H(7)(+)) by 37.6 kcalmol(-1). The synthesized arenium ions 1 are stable in solution at room temperature for periods ranging from a few hours to days. This unusual stability is attributed to: 1) the thermodynamic stabilization of the arenium ion by two beta-silyl substituents
芳基环上具有不同取代方式的一系列双甲硅烷基化的nium离子1已通过瞬态甲硅烷基离子从2-芳基取代的2,6-二甲基-2,6-二硅庚烷(2)氢化物提取而合成。已经通过其特征性NMR化学位移确定了芳族离子,(δ(29)Si = 19.1-25.6,δ(13)C(ipso)= 89.0-102.4,δ(13)C(邻)= 160.9-182.0,由B3LYP / 6-311G(d,p)的结构,能量和磁性能的量子力学计算支持的delta(13)C(meta)= 132.5-146.9,delta(13)C(para == 150.2-169.9) )// B3LYP / 6-31G(d)+ DeltaZPVE理论水平。计算清楚地揭示了芳基离子1中甲硅烷基取代基的电荷分散和稳定作用。双甲硅烷基化的苯氮离子1a比母体苯离子(C(6)H(7)(+))稳定37.6 kcalmol(- 1)。合成的氢氧根离子1