An elegant cascade cross‐coupling and in situ hydrogenation reaction has been established by visiblelightcatalysis. Combining cheap and earth‐abundant eosin Y as a photosensitizer and the cobalt chloride complex, Co(dmgH)2Cl2 (dmgH=dimethylglyoximate), as a catalyst, the desired oxidative cross‐coupling products and reductive hydrogenation products could be achieved in good to excellent yields without
Moderate oxidation levels of Ru nanoparticles enhance molecular oxygen activation for cross-dehydrogenative-coupling reactions via single electron transfer
chemistry reaction to a heterogeneous one, using nanocatalysts, it is essential to investigate the underlying principles and the associated dominant factors of methodologies between inorganic nanoparticles and organic substrates. Here it is reported that novel, hydrothermally synthesized ruthenium (Ru) nanoparticles performed differently in molecular oxygen activation via singleelectrontransfer for c
Cross-dehydrogenative-coupling reaction has long been recognized as a powerful tool to form a C-C bond directly from two different C-H bonds. Most current processes are performed by making use of stoichiometric amounts of oxidizing agents. We describe here a new type of reaction, namely cross-coupling hydrogen evolution (CCHE), with no use of any sacrificial oxidants, and only hydrogen (H2) is generated
交叉脱氢偶联反应长期以来被认为是直接由两个不同的 CH 键形成 CC 键的有力工具。大多数当前方法是通过使用化学计量量的氧化剂进行的。我们在此描述了一种新型反应,即交叉偶联析氢 (CCHE),不使用任何牺牲氧化剂,仅产生氢气 (H2) 作为副产物。通过将曙红 Y 和石墨烯负载的 RuO2 纳米复合材料 (G-RuO2) 结合作为光敏剂和催化剂,在室温可见光照射下以定量产率获得所需的交叉偶联产物和 H2。
Cobalt-Catalyzed Cross-Dehydrogenative Coupling Reaction in Water by Visible Light
By using catalytic amount of CoCl2 with dmgH (dimethylglyoxime) as ligand to form a photosensitizer in situ, a highly selective, efficient, and environmentally benign visible light mediated cross-dehydrogenative coupling (CDC) reaction has been developed in aqueous medium. The desired cross-coupling C-C bonds that involve C-sp3 with C-sp, C-sp2, and C-sp3, respectively, were achieved exclusively in high yields without formation of any other byproduct.
Cross-Coupling Hydrogen Evolution Reaction in Homogeneous Solution without Noble Metals
A highly efficient noble-metal-free homogeneous system for a cross-coupling hydrogen evolution (CCHE) reaction is developed. With cheap, earth-abundant eosin Y and molecular catalyst Co(dmgH)(2)Cl-2, good to excellent yields for coupling reactions with a variety of isoquinolines and indole substrates and H-2 have been achieved without any sacrificial oxidants. Mechanistic insights provide rich information on the effective, dean, and economic CCHE reaction.