Chemistry of <i>C</i>-Trimethylsilyl-Substituted Heterocarboranes. 26. Further Investigation of Oxidative Cage Closure, Cage Fusion, and Cage Isomerizations: Synthetic, Structural, and Bonding Studies on “Carbons Adjacent” and “Carbons Apart” Tetracarba-<i>nido</i>-dodecaborane(12) Derivatives
作者:Narayan S. Hosmane、Thomas J. Colacot、Hongming Zhang、Jimin Yang、John A. Maguire、Ying Wang、Maria B. Ezhova、Andreas Franken、Temesgen Demissie、Kai-Juan Lu、Dunming Zhu、Julie L. C. Thomas、Jess D. Collins、Thomas G. Gray、Suneil N. Hosmane、William N. Lipscomb
DOI:10.1021/om980606k
日期:1998.11.1
the C4B8 compounds were found to have nonrigid stereochemistries; both the 11B and 13C NMR spectra of the “carbons apart” compounds consisted of single resonance peaks, indicating rapid atom equilibration on the NMR time scale. The “carbons adjacent” compounds showed 11B NMR spectra of six resonance peaks; each had a different chemical shift and peak-area ratio pattern. The 11B NMR spectra of the “carbons
许多一般形式的四碳碳硼烷(SiMe 3)2(R)2 C 4 B 8 H 8(R = SiMe 3(III和IV)Me(XIII和XIV),n- Bu(VII,XI和XII),t -Bu(VIII))是通过相应的Nido -2-(SiMe 3)-3-(R)-2,3-C 2 B 4 H 6单价或二价阴离子与NiCl反应而合成的2在Ñ正己烷。最近报道了其中R =n- Bu(I),t- Bu(II)的n-碳氢化合物,它们是由Me 3 SiC⋮CR与B 5 H 9的反应获得的。四碳化合物是反应的次要产物,产率为VIII的13%至XI的37%。主要产物为相应的Closo -1-(SiMe 3)-2-(R)-1,2-C 2 B 4 H 4化合物,得率从69%(R = t-Bu(VI))至32%(R = SiMe 3)。所述闭合碳-carboranes其中R = Ñ -Bu(V),吨-Bu(VI)可被转化