Kinetic Investigation of Micellar Promoted Pyridine based Oximate and Hydroxamate Catalysis on Phosphotriester Pesticides
作者:Hitesh K. Dewangan、Rekha Nagwanshi、Kallol K. Ghosh、Manmohan L. Satnami
DOI:10.1007/s10562-016-1912-5
日期:2017.2
nucleophiles toward the electrophilic center of P=O and P=S bond of phosphate ester shows prominent effect in the presence of cetyltrimethylammoniumbromide (CTAB) and tetradecyltrimethylammonium bromide (TTAB) micelles than aqueous media. The adjacent lone pair of electron in nitrogen atom on the nucleophile moiety of 2-PyOx and 2-PyHA helps to augment the reactivity compared to presence in remote
Mechanistic insights into the <i>in vitro</i> metal-promoted oxidation of (di)azine hydroxamic acids: evidence of HNO release and <i>N</i>,<i>O</i>-di(di)azinoyl hydroxylamine intermediate
作者:Edinilton Muniz Carvalho、Lionel Rechignat、Eduardo Henrique Silva de Sousa、Luiz Gonzaga de França Lopes、Remi Chauvin、Vania Bernardes-Génisson
DOI:10.1039/d0nj00753f
日期:——
oxidant-dependent ability of hydroxamicacids to release nitroxyl (HNO), a small inorganic molecule endowed with various biological properties, is addressed from a mechanistic standpoint. Indeed, the exact mechanism of the hydroxamicacidoxidation in physiological conditions and the direct or indirect characterization of the intermediates remain elusive. In this work, intermolecular oxidation of isonicotino-,
从机理的角度出发,研究了异羟肟酸释放出具有多种生物学特性的无机小分子硝基氧(HNO)的氧化剂依赖性。实际上,在生理条件下异羟肟酸氧化的确切机理以及中间体的直接或间接表征仍然难以捉摸。在这项工作中,通过1 H NMR,MS,EPR和UV-vis技术监测了在生理pH(7.4)下用K 3 [Fe III(CN)6 ]对异烟酸酯,烟酸酯和吡嗪酮异羟肟酸的分子间氧化反应。。虽然nitrosocarbonyl(二)吖嗪中间体,(二)AZ-C(O)-NO,可以是先验设想,它实际上对应Ñ,识别出的O-二(二)叠氮酰基羟胺(AzC(O)NHOC(O)Az)和HNO,第一个通过1 H NMR,第二个基于EPR和UV-vis实验,使用[2-(4 -羧基苯基)-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物](cPTIO)自旋阱。不稳定的N,O-二(二)叠氮酰基羟胺中间体在水性缓冲介质中的分解显示产生相应的羧
Iron(III) Tris(pyridinehydroxamate)s and Related Nickel(II) and Zinc(II) Complexes: Potential Platforms for the Design of Novel Heterodimetallic Supramolecular Assemblies
作者:Clodagh Mulcahy、Krystyna A. Krot、Darren M. Griffith、Kyrill Yu. Suponitsky、Zoya A. Starikova、Celine J. Marmion
Mechanochemical Synthesis of N‐Aryl Amides from O‐Protected Hydroxamic Acids
作者:Emmanouil Broumidis、Mary C. Jones、Filipe Vilela、Gareth O. Lloyd
DOI:10.1002/cplu.202000451
日期:2020.8
protocols for the synthesis of an array of N‐arylamides have been developed. This was achieved by a C−N cross‐coupling between O‐pivaloyl hydroxamicacids and aryl iodides or aryl boronic acids, in the presence of a stoichiometric amount of a copper mediator. The effectiveness of this method is highlighted by the high‐yielding (up to 94 %), scalable (up to 8 mmol), and rapid (20 minutes) synthesis of N‐aryl
Photoinduced one-pot synthesis of hydroxamic acids from aldehydes through in-situ generated silver nanoclusters
作者:Yasser M. A. Mohamed、Yasser A. Attia、Eirik Johansson Solum
DOI:10.1007/s11164-018-3549-z
日期:2018.12
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
异羟肟酸由于在应用化学中的广泛应用而引起了极大的关注。在本报告中,通过可见光介导的各种杂环,芳族和脂肪族醛1a–j到其相应的异羟肟酸2a–j的可见光催化转化,实现了改良的Angeli–Rimini方法,产率为81–93%。已经研究了维生素K 3作为光氧化还原催化剂的独特能力,以加速全新反应机制的发展并能够构建具有挑战性的碳氮键。首次表明维生素K 3和醛是快速原位还原Ag +的主要原因离子进入具有2.87 eV带隙能量且尺寸小于2 nm的催化光致发光Ag纳米簇。已经提出了该反应的机理,并得到了紫外-可见,TEM,ESI / MS,FT-IR,1 H NMR和13 C NMR分析的支持。所研究的方法利用了容易获得的试剂,并以高收率生产了异羟肟酸,而没有形成副产物,使其简单,实用且具有成本效益。