Solvolysis of 2-Bicyclo[3.2.2]nonyl <i>p</i>-Toluenesulfonate. Evidence for the Formation of Classical Carbocation Intermediates
作者:Takao Okazaki、Eiichi Terakawa、Toshikazu Kitagawa、Ken'ichi Takeuchi
DOI:10.1021/jo9914061
日期:2000.3.1
2-bicyclo[3.2.2]nonyl cation is classical and that 10 is formed at a former ionization stage than 2-substituted bicyclo[3.2.2]nonane. The (13)C redistributions for both exo-2-substituted bicyclo[3.3.1]nonane and 11, which are yielded via 1,3-hydride shift, were similar to that of 2-substituted bicyclo[3.2.2]nonane, suggesting that 1,3-hydride shift occurs mainly at the solvent-separated ion pair.
2-双环[3.2.2]壬基对甲苯磺酸盐(6-OTs)的溶剂分解速率几乎与2,2,2-三氟乙醇(TFE)中环庚基对甲苯磺酸盐的溶解速率相同。这表明6-OTs中的乙烯桥不会显着提高该速率,并且6-OTs在没有嵌合助剂的情况下电离。[1-(13)C] -2-双环[3.2.2]壬基对甲苯磺酸盐在甲醇或TFE中的溶剂分解得到2-取代的双环[3.2.2]壬烷,外-2-取代的双环[3.3.1] ]壬烷,2-双环[3.2.2]壬烯(10)和2-双环[3.3.1]壬烯(11),其(13)C标记的分布是通过定量(13)C NMR分析使用松弛剂。(13)C标签仅放置在两个位置,它们的比率不统一,并且10个标签中的标签混乱程度不及其他产品。这些结果表明2-双环[3.2.2]壬基阳离子是经典的,并且在2-取代的双环[3.2.2]壬烷之前的电离阶段形成了10。通过1,3-氢化物移位获得的exo-2-取代的双环[3.3