化学
苯甲酸酯
二苯甲酮
闪光光解
光化学
胶束
芳基
乙腈
胶束溶液
环己烷
有机化学
动力学
反应速率常数
水溶液
物理
烷基
量子力学
作者
Gastón Siano,Stefano Crespi,Mariella Mella,Sergio M. Bonesi
标识
DOI:10.1021/acs.joc.9b00334
摘要
Irradiation of a series of p-substituted aryl benzoates under N2 atmosphere in homogeneous and micellar media was investigated by means of steady-state condition and of time-resolved spectroscopy. A notable selectivity in favor of the 2-hydroxybenzophenone derivatives was observed in micellar media. The benzophenone derivatives were the main photoproduct. On the other hand, in homogeneous media (cyclohexane, acetonitrile, and methanol) the observed product distribution was entirely different, viz. substituted 2-hydroxybenzophenones, p-substituted phenols, benzyl and benzoic acid were found. The binding constants in the surfactant were also measured and NOESY experiments showed that the aryl benzoates were located in the hydrophobic core of the micelle. Laser flash photolysis experiments led to the characterization of both p-substituted phenoxy radical and substituted 2-benzoylcyclohexadienone transients in homogeneous and micellar environment.
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