Low-temperature X-ray structural studies of the ester and ether derivatives of cis- and trans-4-tert-butyl cyclohexanol and 2-adamantanol: application of the variable oxygen probe to determine the relative σ-donor ability of C–H and C–C bonds
作者:Marisa Spiniello、Jonathan M. White
DOI:10.1039/b303453d
日期:——
Results of low-temperature X-ray structural studies for five cis-, and three trans-4-tert-butyl cyclohexanol, and six 2-adamantanol ester and ether derivatives are reported. Plots of CâOR bond distance against pKa(ROH) for derivatives of axial alcohol (5), equatorial alcohol (6) and 2-adamantanol derivatives (7) give slopes of â2.77 Ã 10â3, â2.86 Ã 10â3 and â3.05 Ã 10â3, respectively. Given that the relative differences in the slopes are modest, no clear distinction can be made about the relative Ï-donor ability of a CâH bond and a CâC bond.
本文报道了五个顺式和三个反式4-叔丁基环己醇以及六个2-金刚烷醇酯和醚衍生物的低温X射线结构研究结果。对于轴向醇(5)、赤道醇(6)和2-金刚烷醇衍生物(7)的衍生物,C─OR键距离与pKa(ROH)的关系图分别给出了斜率为-2.77×10^-3、-2.86×10^-3和-3.05×10^-3。鉴于斜率之间的相对差异较小,无法明确区分C─H键和C─C键的相对σ-供体能力。