substitution product in a photostimulated slow reaction when the nucleophile is Ph(2)P(-) ion; the reaction occurs faster with the nucleophile Me(3)Sn(-) ion. All these reactions can be explained by the S(RN)1 mechanism as they did not occur in the dark and were inhibited by p-dinitrobenzene when photostimulated. In competition experiments, 1-haloadamantane showed more reactivity than 2-haloadamantane. Either
2-
溴金刚烷(2-BrAd)在液
氨中与二苯基
磷(Ph(2)P(-))离子反应,而
2-氯金刚烷(2-ClAd)在相同的实验条件下没有反应。但是,2-ClAd在其与
三甲基锡烷基(Me(3)Sn(-))离子的光刺激反应中产生了2-(
三甲基锡烷基)
金刚烷。当亲核试剂为Ph(2)P(-)离子时,化合物1-ClAd在光刺激的慢反应中产生取代产物;使用亲核试剂Me(3)Sn(-)离子,反应发生得更快。所有这些反应都可以通过S(RN)1机理来解释,因为它们在黑暗中不会发生,并且在光刺激下会被
对二硝基苯抑制。在竞争实验中,1-hahamanantantane显示出比2-haloadamantane更多的反应性。使用Ph(2)P(-)或Me(3)Sn(-)离子时,1-BrAd为1。反应性是2-BrAd的4倍,而1-ClAd是具有Me(3)Sn(-)离子的2-ClAd的12倍。在
1,2-二氯金刚烷(7)与Ph(