its derivatives have been examined as a function of temperature. For several cases it was possible to determine the rates and activation energy for interconversion of the two possible chair-chair conformations of the compounds. In other instances, the point of equilibrium was found to be such that only one isomer predominated to the extent that kinetic studies were impossible. For 2,2-difluoro-cis-decalin
2,2-difluoro-cis-decalin 及其一些衍
生物的fluorine-19 磁共振谱已被检查为温度的函数。对于几种情况,可以确定化合物两种可能的椅椅构象相互转化的速率和活化能。在其他情况下,发现平衡点只有一种异构体占主导地位,以至于不可能进行动力学研究。对于 2,2-difluoro-cis-decalin,活化能被确定为 14.0 ± 0.8 kcal/mole。在环连接处被烷基取代后,活化能降低至 9.7 ± 0.6 kcal/mol。在 1、2 或 6 位有甲基时,一种异构体受到青睐,以至于无法检测到平衡。