作者:Ismail G. Mursakulov、E.A. Ramazanov、M.M. Guseinov、Nikolai S. Zefirov、V.V. Samoshin、Ernest L. Eliel
DOI:10.1016/0040-4020(80)80092-5
日期:1980.1
2-trisubstituted cyclohexanes have been determined by 1H NMR. The gauche-interaction of substituents in the 1,1-dimethyl series are, in general, very close to those of monosubstituted cyclohexanes. However, in the spiro-compounds 5 and 6 the equatorial conformers are somewhat destabilized by gauche-interactions though still enthalpy preferred. In contrast, the enthalpy preferred conformer in the 1,1-diethyl
通过1 H NMR测定了一系列1,1,2-三取代的环己烷中的构象平衡位置。通常,在1,1-二甲基系列中的取代基的古谢-相互作用非常接近于单取代的环己烷。然而,在螺环化合物5和6中,赤道构象异构体由于树胶-相互作用而有些不稳定,尽管仍是优选的焓。相反,在1,1-二乙基系列中焓优选的构象异构体是轴向的。