Understanding the role played by protic ionic liquids (PILs) and the substituent effect for enhancing the generation of Z-cinnamic acid derivatives†
作者:Rocío B. Rodríguez、Ramiro L. Zapata、María L. Salum、Rosa Erra-Balsells
DOI:10.1039/d0pp00072h
日期:2020.6
Photoisomerization of a series of substituted E-cinnamic acids in MeCN in their acid forms and as their corresponding protic ionic liquids (PILs) with light of 300 nm is studied. The nature, strength, number, and position effects of substituents on the photochemical behavior of E-cinnamic derivatives are investigated. The photosensitization of the reaction in the presence of Michler's ketone is also
研究了MeCN中一系列取代的E-肉桂酸的酸形式及其相应的质子离子液体(PIL)在300 nm的光下的光异构化。研究了取代基的性质,强度,数量和位置对E-肉桂酸酯衍生物光化学行为的影响。还研究了在米氏酮存在下该反应的光敏化在366 nm的情况,这表明反应中涉及三重激发态。由于n的存在在所有情况下,形成PIL所需的丁胺都会显着提高光产物的产率,并讨论了PIL的作用。因此,对这些基本方面的理解已经使我们能够建立成功地合成Z-肉桂酸的优异且实用的合成方案。