Nuclear magnetic resonance spectroscopy. Conformational equilibria and equilibration of 4,4-difluorocyclohexanone and 6,6-difluoro-cis-decal-2-ones
作者:Ruth E. Lack、Camille Ganter、John D. Roberts
DOI:10.1021/ja01027a020
日期:1968.12
of ring inversion and conformational equilibration of 6,6-difluoro-cis-decal-2-one and 10-methyl-6,6-difluoro-cis-decal-2-one have been determined using fluorine magnetic resonance spectroscopy. The activation energies were found to be 11.3 ± 0.3 and 9.5 ± 0.1 kcal/mol, respectively. 4,4-Difluorocyclohexanone, however, appears to exchange its fluorines between conformationally nonequivalent sites rapidly
6,6-difluoro-cis-decal-2-one 和 10-methyl-6,6-difluoro-cis-decal-2-one 的环倒置率和构象平衡率已使用氟磁共振光谱测定。发现活化能分别为 11.3 ± 0.3 和 9.5 ± 0.1 kcal/mol。然而,4,4-二氟环己酮似乎在核磁共振时间尺度上甚至在-180o 的构象非等价位点之间快速交换其氟。