通过时间分辨光谱研究了在过硫酸铵存在下有机/水混合物中的芳基甲磺酸酯和芳基二乙基磷酸酯的单电子氧化。光生 SO 4 ˙ -自由基阴离子和被检测底物之间的光致电子转移 (ET)显示速率常数 ( k ET ) 约为 10 9 –10 10 M -1 s -1并且生成的自由基阳离子表现出宽吸收带(350-550 nm),寿命值在 7-62 μs 范围内,具体取决于芳族取代基的性质。log ( k ET ) 和 Δ之间的相关性令人满意G 0 ET证明了 ET 过程遵循 Marcus 模型。
通过时间分辨光谱研究了在过硫酸铵存在下有机/水混合物中的芳基甲磺酸酯和芳基二乙基磷酸酯的单电子氧化。光生 SO 4 ˙ -自由基阴离子和被检测底物之间的光致电子转移 (ET)显示速率常数 ( k ET ) 约为 10 9 –10 10 M -1 s -1并且生成的自由基阳离子表现出宽吸收带(350-550 nm),寿命值在 7-62 μs 范围内,具体取决于芳族取代基的性质。log ( k ET ) 和 Δ之间的相关性令人满意G 0 ET证明了 ET 过程遵循 Marcus 模型。
Irradiation of electron-donating substituted phenyl halides (fluorides and chlorides) or esters (mesylates, triflates and phosphates) in aqueous MeCN in the presence of KCN gives the corresponding benzonitriles in 48 to 100% yield through an ArSN1 reaction with the intermediacy of a triplet phenyl cation.
A convenient photochemical flow protocol for the formation of aryl‐carbon bonds via photogenerated phenyl cations has been developed. A wide range of phenylated products, including biaryls, allylarenes, 2‐arylacetals and benzyl γ‐lactones, was smoothly synthesized in satisfactory yields under metal‐free conditions. The adoption of a flow reactor often allowed us to adopt higher concentrations of substrates
A mild and versatile method for the photoinduced three-component synthesis of 3-arylacetals and ketals is presented. Desired targets are smoothly obtained by irradiating aromatic halides or esters in alcohols, in the presence of vinyl ethers.