开发了一种方便,温和的一锅法,该方法通过在室温下于水中在对甲苯磺酸存在下用可重用的聚合重氮化剂对芳族胺进行顺序重氮化-碘化来高产率地合成碘代芳烃。该方法是通用的,并且是已知的重氮化-碘化方法的最绿色的替代方法。该方法对于制备1 H-苯并[ d ] [1,2,3]三唑和苯并[ d ] [1,2,3]噻二唑也是有效的。 重氮化-卤化-碘化-杂环-胺
the concentration of sulfuricacid. Treatment of 4-haloazoxybenzenes with sulfuricacid gave 4-(p-halophenylazo)phenols and 4-haloazobenzenes (13) as major products together with 2-(p-halophenylazo)phenols and 5-halo-2-(phenylazo)phenols as minor products. Yields of reduction products 6 and 13 increased as the halosubstituent became heavier in the following sequence: F→Cl→Br→I.
Metathesis-active ligands enable a catalytic functional group metathesis between aroyl chlorides and aryl iodides
作者:Yong Ho Lee、Bill Morandi
DOI:10.1038/s41557-018-0078-8
日期:2018.10
for the most part, relied on relatively strong driving forces which often require highly reactive reagents to generate irreversibly a desired product in high yield and selectivity. These approaches generally prevent the use of the same catalytic strategy to perform the reverse reaction. Here we describe a catalytic functional group metathesis approach to interconvert, under CO-free conditions, two
作者:J. Pérez-Miqueo、A. Altube、E. García-Lecina、A. Tron、N. D. McClenaghan、Z. Freixa
DOI:10.1039/c6dt01817c
日期:——
models to study the effect that extendedconjugation and substitution pattern has on the photochromic behavior of azobenzene-appended 2-phenylpyridyl (ppy) ligands. For this purpose four azobenzene-containing ppy ligands were synthesized. With these ligands, nine iridium(III) complexes containing up to three appended azobenzenes were synthesized. Analysis of their photochromic behaviour by means of UV-vis
Photoinduced<i>N</i>-Methylation and<i>N</i>-Sulfonylation of Azobenzenes with DMSO Under Mild Reaction Conditions
作者:Ning Xu、Yan Zhang、Wei Chen、Pinhua Li、Lei Wang
DOI:10.1002/adsc.201701548
日期:2018.3.20
with dimethyl sulfoxide (DMSO) was developed in the absence of an external photosensitizer under mild conditions. The reactions underwent smoothly to generate the corresponding products in high yields through a radical addition using the starting material azobenzene as a photosensitizer. This strategy features simple operation, easily available starting materials and DMSO acting as both methylating
The additionreactions between aromatic azoarenes and N-substituted formamides are described. This direct and practical method provides a novel approach for the synthesis of formylhydrazines and semicarbazides in the presence of NaI/DTBP and imidazole/DCP catalytic systems, respectively. It can be seen that C–H or C–N from N-substituted formamides could be cleaved selectively under such transition-metal-free