revealed that Cu 2 O and CuI were deposited on the MWCNTs in the cubic and γ phases, respectively. These results also showed that the Cu-containing MWCNTs exhibited weak to strong electron-accepting (Lewis acidic) properties. The catalytic activities of these materials were studied for the synthesis of biologically significant N -(pyridin-2-yl)benzamides via the oxidative amidation of aryl aldehydes
摘要 使用湿浸渍法将 Cu 2 O 和 CuI 负载在多壁碳纳米管 (MWCNTs) 上,并通过粉末 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜和能量色散 X 射线光谱对所得材料进行了全面表征。 、透射电子显微镜和程序升温脱附与氨分析。这些实验的结果表明,Cu 2 O 和CuI 分别以立方相和γ 相沉积在MWCNT 上。这些结果还表明,含铜的多壁碳纳米管表现出弱到强的电子接受(路易斯酸性)特性。研究了这些材料的催化活性,用于通过芳基醛与 2-氨基吡啶的氧化酰胺化合成具有生物学意义的 N-(吡啶-2-基)苯甲酰胺。产物的产率在 50%–95% 的范围内,选择性为 100%。值得注意的是,就产物的分离产率而言,CuI/MWCNT 催化剂比 Cu 2 O/MWCNT 催化剂更有效,尽管这两种催化剂中的后者表现出更好的可回收性。与共价 CuI 相比,在酸活化 MWCNTs 的极性与离子 Cu
Singlet oxygen mediated dual C–C and C–N bond cleavage in visible light
作者:Ritu、Charu Sharma、Sharvan Kumar、Nidhi Jain
DOI:10.1039/d0ob00563k
日期:——
A tandem cleavage of carbon-carbon and carbon-nitrogen bonds in imidazo[1,2-a]pyridines and imidazo[1,2-a]quinolines is reported in the presence of eosin Y and visible light. The ring opening occurs under ambient conditions through singletoxygen insertion, bond cleavage and CO2 elimination, and produces N-(pyridin-2-yl) amides and N-(quinolin-2-yl) amides in high yields. The reaction shows good versatility