Photochemical Transformation of some 3-benzyloxy-2-(benzo[<i>b</i>]thiophen-2-yl)-4<i>H</i>chromen-4-ones: A Remote Substituent Effect
作者:Aarti Dalal、Radhika Khanna、Ramesh C. Kamboj
DOI:10.1515/chem-2018-0009
日期:2018.2.21
Abstract The effect on photochemical transformations of the substituents present remotely from the reaction site in 3-benzyloxy-2-(benzo[b]thiophen-2-yl)-4H-chromen-4-ones has been determined. The structure(s) of the substrates and photoproducts were established by spectroscopic techniques (UV, IR, and NMR). The substituents had profound effects on product yield and distribution. Electron withdrawing
摘要 已经确定了远离 3-benzyloxy-2-(benzo[b]thiophen-2-yl)-4H-chromen-4-ones 的反应位点存在的取代基对光化学转化的影响。基材和光产物的结构通过光谱技术(UV、IR 和 NMR)确定。取代基对产物产率和分布有深远的影响。色酮核的苯型部分上的吸电子基团 (EWGs) 增加了光产物的产率,而给电子基团 (EDGs) 降低了产率。这些结果可能归因于激发期间取代基的“状态转换”。图形概要