Photochemical Magnetic-Field Effects of Isoquinoline<i>N</i>-Oxide in Various Alcohols
作者:Norisuke Hata
DOI:10.1246/bcsj.59.2723
日期:1986.9
was found for the first time in the case of a photochemical isomerization of isoquinoline N-oxide into lactam (1-isoquinolone). The chemical yield of the lactam showed a minimum at a higher magnetic field as one changes the reaction medium from t-butyl alcohol to 2-propanol (or ethanol) and then to methanol, which was the same order as the pKa value (t-butyl alcohol>2-propanole≈ethanol>methanol). Such
在异喹啉 N-氧化物光化学异构化为内酰胺(1-异喹诺酮)的情况下,首次发现由于 HFI-J 机制而产生的磁场效应的显着溶剂依赖性。当反应介质从叔丁醇变为 2-丙醇(或乙醇),然后变为甲醇时,内酰胺的化学产率在较高磁场下显示最小值,这与 pKa 值(t-丁醇>2-丙醇≈乙醇>甲醇)。这种溶剂依赖性提供了确凿的证据,即光异构化通过 S1 型单线态自由基-离子对中间体进行,该中间体通过 N-氧化物阳离子自由基中的 N→O 基团与 OH 基团之间的氢键连接。醇的阴离子自由基。另一个有趣的发现是,在叔丁醇中进行光化学异构化的情况下,内酰胺的化学产率在大约 0.9T 和 1.35T 处显示出明显的最大值,而最小值在约 0.72T 处。异常...