An Exceptionally Stable Ti Superoxide Radical Ion: A Novel Heterogeneous Catalyst for the Direct Conversion of Aromatic Primary Amines to Nitro Compounds
作者:Gajanan K. Dewkar、Milind D. Nikalje、Iliyas Sayyed Ali、Abhimanyu S. Paraskar、H. S. Jagtap、A. Sudalai
A matrix-bound superoxide radical anion, generated by treating Ti(OR)4 (R=iPr, nBu) with H2 O2 , is a selective heterogeneous catalyst for the oxidation of anilines to the corresponding nitroarenes with 50 % aqueous H2 O2 [Eq. (1)]. Yields of 82-98 % are obtained, even with anilines bearing electron-withdrawing substituents (R=NO2 , COOH).
通过用H 2 O 2处理Ti(OR)4(R = iPr,nBu)生成的与基质结合的超氧自由基阴离子是一种选择性多相催化剂,用于用50%H 2 O水溶液将苯胺氧化为相应的硝基芳烃2 [式 (1)]。即使具有带吸电子取代基的苯胺(R = NO 2,COOH),也可得到82-98%的产率。
Hydroheteroarylation of Unactivated Alkenes Using <i>N</i>-Methoxyheteroarenium Salts
作者:Xiaoshen Ma、Hester Dang、John A. Rose、Paul Rablen、Seth B. Herzon
DOI:10.1021/jacs.7b02388
日期:2017.4.26
reductive coupling of unactivated alkenes with N-methoxy pyridazinium, imidazolium, quinolinium, and isoquinolinium salts under hydrogen atom transfer (HAT) conditions, and an expanded scope for the coupling of alkenes with N-methoxy pyridinium salts. N-Methoxy pyridazinium, imidazolium, quinolinium, and isoquinolinium salts are accessible in 1-2 steps from the commercial arenes or arene N-oxides (25-99%)
作者:Roshinee Costa、Natalie Barone、Christopher Gorczycka、Ernest F. Powers、William Cupelo、Joseph Lopez、Richard S. Herrick、Christopher J. Ziegler
DOI:10.1016/j.jorganchem.2009.02.024
日期:2009.6
We present the synthesis and characterization of a series of dioxime and pyridine-2-aldoxime complexes of rhenium(I) tricarbonyl. Complexes of the formula ReL(CO)3X (L = dioxime (1,2), dimethylglyoxime (3,4), diphenylglyoxime (5,6), 1,2-cyclohexanedione dioxime (7,8); X = Cl, Br) can be readily generated by reaction of the neutral ligand with Re(CO)5X (X = Cl, Br) or [Re(CO)3(H2O)3]Br. A similar set
我们介绍了synthesis(I)三羰基的一系列二肟和吡啶-2-醛肟配合物的合成和表征。配方的配合物ReL(一氧化碳)第三名X(L =二肟(1,2),二甲基乙二肟(3,4),diphenylglyoxime(5,6),1,2-环己二酮二肟(7,8); X =氯,溴)可通过以下的反应来容易地生成中性配体与回覆(一氧化碳)5X (X = Cl,Br)或 [回覆(一氧化碳)第三名(H2个Ø)第三名]溴。下式的一组类似的吡啶-2-醛肟ReL(一氧化碳)第三名X(L =吡啶-2-醛肟(9,10),2- pyridylamidoxime(11,12); X =氯,溴)也可以以类似的方式合成。化合物1 - 6,9和12是由单晶的X射线衍射特征的。这些络合物都表现出肟配体的双齿配位以及羰基在金属周围的预期面排列,卤化物完成了八面体配位球。肟基在所有配合物中均保持质子化。化合物1 - 12中从MLCT跃迁产生的紫外-可见区域的所有显示的吸收。
Merging Halogen-Atom Transfer (XAT) and Cobalt Catalysis to Override E2-Selectivity in the Elimination of Alkyl Halides: A Mild Route toward <i>contra</i>-Thermodynamic Olefins
作者:Huaibo Zhao、Alastair J. McMillan、Timothée Constantin、Rory C. Mykura、Fabio Juliá、Daniele Leonori
DOI:10.1021/jacs.1c06768
日期:2021.9.15
mechanistically distinct tactic to carry E2-type eliminations on alkyl halides. This strategy exploits the interplay of α-aminoalkyl radical-mediated halogen-atom transfer (XAT) with desaturative cobalt catalysis. The methodology is high-yielding, tolerates many functionalities, and was used to access industrially relevant materials. In contrast to thermal E2eliminations where unsymmetrical substrates give regioisomeric
High-Throughput Screening of Earth-Abundant Water Reduction Catalysts toward Photocatalytic Hydrogen Evolution
作者:Rachel N. Motz、Eric M. Lopato、Timothy U. Connell、Stefan Bernhard
DOI:10.1021/acs.inorgchem.0c02790
日期:2021.1.18
high-throughput photoreactors for the parallelsynthesis of novel WRCs and colorimetric screening of hydrogen evolution. This unique approach allowed rapid optimization of photocatalytic water reduction using the organic photosensitizer Eosin Y and the archetypal cobaloxime WRC [Co(GL1)2pyCl], where GL1 is dimethylglyoxime and py is pyridine. Subsequent combinatorial synthesis generated 646 unique cobalt complexes