The palladium‐catalyzed oxidative carbonylation of amines toward the synthesis of oxalamides has been established around 30 years ago and it usually needs the presence of (over)stoichiometric amounts of oxidant. In this work, the first transformation of this type in which the oxidant was replaced by visible light is described. The new approach uses a simple robust Pd complex, which can even be partially
The conversion of carbon monoxide (CO) into high-value organic molecules has long been pursued by both industry and academia. One of the central challenges is to realize carbon–carbon coupling with high selectivity for CO insertion. We report here a highly selective Au/ZnO composite catalyst for one-step oxidative coupling of CO with secondary amines, producing oxamides. The reaction is >99% selective
工业界和学术界长期以来一直致力于将一氧化碳 (CO) 转化为高价值的有机分子。核心挑战之一是实现对 CO 插入具有高选择性的碳-碳偶联。我们在这里报道了一种高选择性 Au/ZnO 复合催化剂,用于 CO 与仲胺的一步氧化偶联,产生草酰胺。该反应在环境条件下具有 >99% 的选择性,在固定床反应器中,催化剂活性在约 120 小时内发生细微变化。显微镜和光谱研究的结合(包括 X 射线光电子能谱、X 射线吸收光谱、CO-傅立叶变换红外光谱、通过非化学计量的 ZnO x ( x > 1) 连接。通过密度泛函理论计算和原位漫反射红外傅里叶变换光谱信号证实了反应机理和关键反应中间体。我们的研究结果为多相催化开辟了一条途径,通过利用界面协同效应实现环境条件下的 CO 转化。
A sustainable, new synthesis of oxalamides, by acceptorless dehydrogenativecoupling of ethylene glycol with amines, generating H2, homogeneously catalyzed by a rutheniumpincercomplex, is presented. The reverse hydrogenation reaction is also accomplished using the same catalyst. A plausible reaction mechanism is proposed based on stoichiometric reactions, NMR studies, X-ray crystallography as well