Role of Free Space and Conformational Control on Photoproduct Selectivity of Optically Pure α-Alkyldeoxybenzoins within a Water-Soluble Organic Capsule
作者:Revathy Kulasekharan、Murthy V. S. N. Maddipatla、Anand Parthasarathy、V. Ramamurthy
DOI:10.1021/jo3023928
日期:2013.2.1
dependent on the alkyl chain length. In an organic solvent, since the cage lifetime is shorter than the time required for intersystem crossing (ISC) of the triplet radical pair to the singlet radical pair the recombination with or without rearrangement of the primary radical pair (phenylacetyl and benzyl) does not occur. Recombination without rearrangement within the capsule as inferred from monitoring the
已经在水中的八酸(OA)胶囊中研究了在激发后产生Norrish I型和II型反应产物的光学纯α-烷基脱氧安息香素。产物的分布不同于有机溶剂中的分布,并且还取决于α-烷基链的长度。最重要的是,形成了在由Norrish I型反应产生的三重对自由基的有机溶剂中未形成的重排产物,其产率取决于烷基链长。在有机溶剂中,由于笼型寿命短于三重自由基对与单重自由基对的系统间穿越(ISC)所需的时间,因此不会发生带有或不带有初级自由基对(苯乙酰基和苄基)重排的重组。–8 s(ISC所需的时间)与我们以前的光物理研究一致,该研究表明胶囊在微秒的时间范围内部分打开和关闭。