化学
分子内力
光化学
X射线光电子能谱
光激发
电子顺磁共振
可见光谱
苯甲酸
激发
立体化学
有机化学
光电子学
化学工程
电气工程
工程类
物理
核磁共振
作者
Parimal C. Sen,Sudipta Raha Roy
出处
期刊:Organometallics
[American Chemical Society]
日期:2023-06-22
卷期号:42 (13): 1658-1666
被引量:1
标识
DOI:10.1021/acs.organomet.3c00210
摘要
Earth-abundant copper salts, in recent years, have attracted the attention of the scientific community with their ability to perform ligand-to-metal charge transfer (LMCT) upon light excitation, thereby eliminating the necessity of a high activation energy barrier required in thermal approaches. Herein, we have reported an application of photoinduced LMCT of Cu(II) species toward the synthesis of benzocoumarin derivatives from 2-aryl benzoic acids via intramolecular dehydrogenative coupling. Existence of light-induced LMCT is confirmed by using detailed mechanistic studies, which include lowering of the d–d transition intensity upon photoexcitation (in UV–visible spectroscopic analysis) and drop-down of the EPR signal intensity on sequential irradiation. Moreover, X-ray photoelectron spectroscopy (XPS) studies reveal the photochemical conversion of Cu(II) to Cu(I) through LMCT. A large number of diverse functional groups could easily be tolerated under this newly developed protocol affording very good yield of the desired benzocoumarins. Additionally, the bulk-scale synthesis of a metabolite compound urolithin A further extends the applicability of this light-induced methodology.
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