- 0D/1D AgI/MoO3 Z-scheme heterojunction photocatalyst: Highly efficient visible-light-driven photocatalyst for sulfamethoxazole degradation
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Low dimension nano photocatalysts show great potential in the field of treating contaminated water for their large surface area and size effect. In this study, a 0D/1D AgI/MoO3 Z-scheme photocatalyst with striking photocatalytic performance was constructed successfully. The one-dimensional MoO3 nanobelts were prepared by a simple hydrothermal method, and then it was modified by AgI nanoparticles in a handy deposition approach. When choosing sulfamethoxazole (SMZ) as the target contaminant, the rate constant value of the optimal 0D/1D AgI/MoO3 composite could hit up to 0.13 min?1, which is nearly 22.4 times and 32.5 times as that of pure MoO3 (0.0058 min?1) and AgI (0.0040 min?1), respectively. A series of detailed characterizations give evidences that the charge transfer in the composite followed Z scheme mechanism. Therefore, efficient separation/transfer and the remained high redox activity of photogenerated carriers played a vital role in the sharply enhanced photocatalytic properties. The possible degradation pathways of SMZ were proposed based on the intermediates detected by high-performance liquid chromatography-mass spectrometry (HPLC-MS). Meanwhile, the magnificent cyclic stability makes the material a promising material in the practical application.
- Xu, Jing,Chen, Juan,Ao, Yanhui,Wang, Peifang
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supporting information
p. 3226 - 3230
(2021/05/29)
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- An organo-NHC catalyzed domino addition approach for the selective synthesis of 5-butynylisoxazoles and subsequent Sonogashira coupling
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A nucleophilic organo N-heterocyclic carbene (NHC) catalysed click-type fast domino addition of allenyl-MgBr to aryl nitrile oxides to produce 5-butynylisoxazoles with excellent selectivity and good yields is reported. The unwanted protonation and subsequent formation of 5-methylisoxazole byproducts is successfully suppressed. Furthermore, a Pd/Ag catalysed protocol for Sonogashira cross-coupling of 5-butynylisoxazoles to obtain the corresponding internal alkynes with high selectivity and yields is developed by minimising the alkyne homo-coupling.
- Kankala, Shravankumar,Jonnalagadda, Sreekantha B.,Vasam, Chandra Sekhar
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p. 76582 - 76587
(2015/09/28)
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- Photocycloaddition of aromatic and aliphatic aldehydes to isoxazoles: Cycloaddition reactivity and stability studies
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The first photocycloadditions of aromatic and aliphatic aldehydes to methylated isoxazoles are reported. The reactions lead solely to the exo-adducts with high regio- and diastereoselectivities. Ring methylation of the isoxazole substrates is crucial for high conversions and product stability. The 6-arylated bicyclic oxetanes 9a-9c were characterized by X-ray structure analyses and showed the highest thermal stabilities. All oxetanes formed from isoxazoles were highly acid-sensitive and also thermally unstable. Cleavage to the original substrates is dominant and the isoxazole derived oxetanes show type T photochromism.
- Griesbeck, Axel G.,Franke, Marco,Neudoerfl, Joerg,Kotaka, Hidehiro
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experimental part
p. 127 - 134
(2011/05/16)
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- PYROLYSE-ECLAIR SOUS VIDE DE 1,2,4-TRIAZOLIDES = UNE ETUDE PAR SPECTROMETRIE DE MASSE EN TANDEM
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A real-time analysis of the flash-vacuum pyrolysis products of some 1,2,4-triazolides has been performed by tandem mass spectrometry.Beside decay products, ketenes and the parent 1,2,4-triazole, 1-acyltriazoles give rise to 5-alkyloxazoles and nitrogen.This ring transformation reaction implies a sigmatropic shift of the acyl group from nitrogen to carbon, loss of nitrogen and cyclisation of the biradical intermediate. 5-aryloxazoles are similarly obtained from 1-aroyltriazoles.
- Maquestiau, A.,Puk, E.,Flammang, R.
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p. 181 - 190
(2007/10/02)
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