Photolysis of 1-Alkylcycloalkanols in the Presence of (Diacetoxyiodo)benzene and I<sub>2</sub>. Intramolecular Selectivity in the β-Scission Reactions of the Intermediate 1-Alkylcycloalkoxyl Radicals
作者:Carla S. Aureliano Antunes、Massimo Bietti、Osvaldo Lanzalunga、Michela Salamone
DOI:10.1021/jo049524y
日期:2004.8.1
and 1-phenylcyclooctoxyl radicals, formation of products deriving from an intramolecular 1,5-hydrogen atom abstraction reaction from the cycloalkane ring has also been observed. The results are discussed in terms of release of ring strain associated to ring opening, stability of the alkyl radical formed by C-alkyl cleavage, and with cycloheptoxyl and cyclooctoxyl radicals, also in terms of the possibility
通过可见光辐照CH 2 Cl 2溶液(含母体1-烷基环烷醇,(二乙酰氧基)碘苯(DIB)和I 2)通过光化学方法生成的1-烷基环烷氧基自由基的CCβ断裂反应通过对反应产物的分析进行了研究。1-烷基环烷氧基自由基根据环的大小和烷基取代基的性质而经历开环和C-烷基键裂解之间的竞争。利用1-丙基环庚氧基,1-丙基环辛氧基和1-苯基环辛氧基,还观察到形成了源自环烷环的分子内1,5-氢原子抽象反应的产物。根据与开环相关的环应变的释放,由C-烷基裂解形成的烷基的稳定性以及与环庚氧基和环辛氧基基团的讨论,还就获得分子内氢原子的良好几何形状的可能性来讨论结果抽象。