89-73-6Relevant articles and documents
Hydroxamic acid and preparation method of hydroxamic acid salt
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Paragraph 0073-0075, (2020/04/06)
The invention discloses a preparation method of hydroxamic acid salt. The preparation method comprises the following steps: mixing organic carboxylic ester, hydroxylamine or/and hydroxylamine salt, acatalyst and an inert solvent; and adding alkali and grinding to obtain the hydroxamic acid salt, and adding acid into the hydroxamic acid salt, grinding, centrifuging or filtering to obtain the hydroxamic acid. The process conditions for producing the hydroxamic acid or the hydroxamic acid salt by a grinding method in the prior art are optimized, the inert solvent diesel oil is used for replacingwater or methanol and the inert solvent is recycled after being subjected to centrifugal separation and simple treatment so that the generation of waste liquid is avoided, the use of toxic solvents is avoided and the operation safety is also greatly improved; besides, the material is in a flowing state during the grinding reaction due to the use of the inert solvent,so that the viscous material is prevented from adhering to the inner wall of the reaction container and the grinding medium, the reaction is more uniform, the temperature is more controllable, the reaction efficiency is greatly improved, the discharging is more convenient and the industrial production is facilitated.
Photoinduced one-pot synthesis of hydroxamic acids from aldehydes through in-situ generated silver nanoclusters
Mohamed, Yasser M. A.,Attia, Yasser A.,Solum, Eirik Johansson
, p. 7173 - 7186 (2018/08/17)
Hydroxamic acids have attracted significant attention due to their widespread use in applied chemistry. In this report, a modified Angeli–Rimini method has been achieved via the visible light-mediated catalytic transformation of a variety of heterocyclic, aromatic and aliphatic aldehydes 1a–j to their corresponding hydroxamic acids 2a–j in 81–93% yield. The unique ability of vitamin K3 as a photoredox catalyst to expedite the development of completely new reaction mechanisms and to enable the construction of challenging carbon–nitrogen bonds has been investigated. It is shown for the first time that the vitamin K3 and aldehyde are largely responsible for rapid in situ reduction of Ag+ ions to catalytic photoluminescent Ag nanoclusters that possess a bandgap energy of 2.87?eV and are less than 2 nm in size. A mechanism for this reaction has been proposed and is supported by UV–Vis, TEM, ESI/MS, FT-IR, 1H NMR and 13C NMR analyses. The investigated method utilizes readily available reagents and produces the hydroxamic acids in high yields without the formation of side products, making it simple, practical and cost-effective.
Benzoic hydroxamate-based iron complexes as model compounds for humic substances: Synthesis, characterization and algal growth experiments
Orlowska, Ewelina,Roller, Alexander,Wiesinger, Hubert,Pignitter, Marc,Jirsa, Franz,Krachler, Regina,Kandioller, Wolfgang,Keppler, Bernhard K.
, p. 40238 - 40249 (2016/05/24)
A series of monomeric and dimeric FeIII complexes bearing benzoic hydroxamates as O,O-chelates has been prepared and characterized by elemental analysis, IR spectroscopy, UV-Vis spectroscopy, electrospray ionization mass spectrometry (ESI-MS), cyclic voltammetry, EPR spectroscopy and for some examples by X-ray diffraction analysis. The stability of the synthesized complexes in pure water and seawater was monitored over 24 h by means of UV-Vis spectrometry. The ability to release iron from the synthesized model complexes has been investigated with algae growth experiments.
