The photochemistry of indenyl alcohols and esters: Substituent effects on the competition between ion- and radical-derived products
作者:J A Pincock、I S Young
DOI:10.1139/v03-131
日期:2003.10.1
The photochemistry of the indenyl acetates 1 and pivalates 2, substituted with X = H, 5-CH3O, and 6-CH3O, have been examined in both methanol and cyclohexane. The precursor alcohols 3 were also found to be photoreactive. Although only radical-derived products were obtained in cyclohexane, both ion- and radical-derived products were formed in methanol. The absence of significant fluorescence emission
已在甲醇和环己烷中检测了被 X = H、5-CH3O 和 6-CH3O 取代的茚乙酸酯 1 和新戊酸酯 2 的光化学。还发现前体醇3具有光反应性。虽然在环己烷中只得到自由基衍生产物,但在甲醇中形成了离子和自由基衍生产物。任何底物 1、2 和 3 都没有明显的荧光发射表明激发的单线态是高度反应性的。提出了一种通过直接异裂裂解得到茚基阳离子的离子衍生产物的机制?羧酸根阴离子对。生成的茚基阳离子在基态是反芳香族的,并且通过这种光化学溶剂分解有效生成它们与相关基态底物的极低反应性形成鲜明对比。对于新戊酸酯2,提出了一种激发态迁移脱羧作用以形成叔丁基衍生产物。 关键词:es...