Conformational analysis and steric effects of substituents in derivatives of 3-oxo-, 3-imino-, and 3-methylenecyclohexene
作者:O. V. Shishkin、E. V. Solomovich、M. Yu. Antipin、A. S. Petrenko、L. A. Kutulya
DOI:10.1007/bf02503780
日期:1997.11
The equilibrium conformations and the inversion barriers of the rings in 3-oxo-, 3-imino-, 3-methylenecyclohexenes and in their methyl,tert-butyl, and phenyl derivatives were calculated by molecular mechanics. The unsubstituted molecules adopt a sofa conformation. The nonbonded interactions between substituents at positions 2 and 4 and the exocyclic double bond lead to a change in the conformation
通过分子力学计算了 3-氧代-、3-亚氨基-、3-亚甲基环己烯及其甲基、叔丁基和苯基衍生物中环的平衡构象和反转势垒。未取代的分子采用沙发构象。2 和 4 位取代基与环外双键之间的非键相互作用导致环的构象变为半椅。随着在氧代、亚氨基和亚甲基衍生物系列中取代基的体积增加,效果增强。环其他位置的取代基仅轻微影响平衡构象。计算结果由2-(4-苯甲酰氧基苄基)-6-异丙基-3-甲基环己-2-烯酮的X-射线结构分析证实。