Rearrangemnets of organometallic compounds. 23. Carbon-skeletal [1,2] anionic and radical sigmatropic rearrangements: group migratory aptitudes as a probe of charge type in the 1,2-shifts of .beta.-phenyl-.beta.-(2-pyridyl)- and .beta.-phenyl-.beta.-(4-pyridyl)ethyl systems
Metal-Free Heterogeneous Semiconductor for Visible-Light Photocatalytic Decarboxylation of Carboxylic Acids
作者:Jiale Shi、Tao Yuan、Meifang Zheng、Xinchen Wang
DOI:10.1021/acscatal.0c05211
日期:2021.3.5
ceramic boron carbon nitrides (BCN). With visiblelight irradiation, BCN oxidize carboxylic acids to give carbon-centered radicals, which were trapped by hydrogen atom donors or employed in the construction of the carbon–carbonbond. In this system, both (hetero)aromatic and aliphatic acids proceed the decarboxylation smoothly, and C–H, C–D, and C–C bonds are formed in moderate to high yields (35 examples
A facile IrIII-catalyzed benzylicalkylation of arenes with alcohols has been accomplished via borrowing hydrogen (BH) pathways, and the newly developed spirocyclic NHC IrIII pincer complex (Cat A) serves as an efficient catalyst for this atom-economical and greener transformation. Some drug or bioactive molecules and functional material templates can be easily constructed by this strategy.
通过借氢 (BH) 途径实现了一种简单的 Ir III催化的芳烃与醇的苄基烷基化,新开发的螺环 NHC Ir III钳形配合物 (Cat A) 可作为这种原子经济和绿色转化的有效催化剂. 一些药物或生物活性分子和功能材料模板可以通过这种策略轻松构建。
Electrochemically Driven C4-Selective Decyanoalkylation of Cyanopyridines with Unactivated Alkyl Bromides Enabling C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Coupling
C4-selective decyanoalkylation has been established to access diverse 4-alkylpyridines in one step. The reaction proceeds through the single electron reduction/radical–radical coupling tandem process under mild electrolytic conditions, achieving the cleavage of the C(sp2)–CN bond and the formation of C(sp3)–C(sp2). The practicality of this protocol is illustrated by no sacrificial anodes, a broad substrate
Electrophotocatalytic Reductive 1,<scp>2‐Diarylation</scp>of Alkenes with Aryl Halides and Cyanoaromatics
作者:Liang Zeng、Jing‐Hao Qin、Gui‐Fen Lv、Ming Hu、Qing Sun、Xuan‐Hui Ouyang、De‐Liang He、Jin‐Heng Li
DOI:10.1002/cjoc.202300174
日期:2023.8.15
The radical-mediated reductive functionalization of aryl halides has been extensively studied. However, the related radical-mediated intermolecular reductive 1,2-diarylation of alkenes, using aryl halides as aryl radical sources, remains unexplored. Herein, a new electrophotocatalytic intermolecular reductive 1,2-diarylation of alkenes is reported using aryl halides and cyanoaromatics to produce polyarylated
Catalytic amounts of 1,3-di(methyl)imidazole-2-ylidene, one of the simplest and most prototypical N-heterocyclic carbenes, can up-convert aldehydes into powerful stoichiometric sources of electrons (Super Electron Donors) for reductive transformations of iodoaryls (Ered < −2 V). In particular, the hydroarylation of 1,1′-diarylethylenes, which may require high temperatures and inherently generate stoichiometric