{110} 结合的 Cu 2 O 菱形十二面体的高光催化活性表明光生电子、空穴和自由基可用于催化某些有机转化。与 Cu 2 O 立方体和八面体相比,Cu 2 O 菱形十二面体在 95% 的水中和室温下,在空穴受体存在下,提供了 4-甲氧基苯基硼酸到 4-甲氧基苯酚的最佳光催化羟基化产率,表明表面控制对催化剂性能也很重要。铜2O 菱形十二面体对各种芳基硼酸也具有普遍优异的产率。芳基硼酸酯是该反应的低效选择。自由基清除剂试验和电子顺磁共振测量表明光生超氧自由基产生并加到芳基硼酸中形成酚类。这项工作表明离子固体可用于光辅助有机反应。
A copper-catalyzedasymmetricallylicsubstitution of γ,γ-disubstituted allylphosphates with arylboronates has been developed for the construction of quaternary stereocenters. High regio- and enantioselectivities have been achieved by employing a hydroxy-bearing chiral N-heterocyclic carbene ligand, and both E and Z substrates provide the same enantiomer as the major product. The mechanistic aspect
thermo- and air-stable Pd0 complex from readily available electron-poor trifluoromethylated phosphine was serendipitously discovered. As detailed and comparative DFT calculations indicate, the stability of the complex is associated with unusually strong ligand–ligand noncovalent interactions. The unique stability and the presence of hydrophobic structural elements of the complex offer several practical
as ligands for PdII-promoted organic reactions are reported for the first time. These ligands were utilized as catalytic sites and integrated into the skeleton of conjugated microporous polymers. By employing these CMP materials as selective regulators, oxidative Heck reactions between arylboronic esters and electronically unbiased alkenes provide highlyselective linear products.
An efficient one-pot synthetic protocol for the synthesis of arylboronic esters has been established. The concentrated addition mixture of trimethylborate with aryl Grignard reagents was treated with low molecular weight diols (ethylene glycol, 1,3-propandiol) and toluene, the corresponding arylboronic esters were isolated in a convenient way with high yields. The diols not only serve as water replacement
catalytic ligand for the PdII-catalyzed oxidative Heck reaction with high linear selectivity. The linear selectivity of CMP-1 is about 30 times higher than that of bipyridine-based monomer ligand. This work opens a new front of using CMP as an intriguing platform for developing highly efficient catalysts in controlling the regioselectivity in organic reactions.