- Synthesis and application of phenyl Nitrone derivatives as acidic and microbial corrosion inhibitors
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Nitrone has drawn great attention due to its wide applications as a 1,3-dipole in heterocyclic compounds synthesis and the bioactivities. With the special structure, nitrone can also be used as ligand in inorganic chemistry. Based on the current research,
- Chen, Shijun,Zhao, Kang,Chen, Gang
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- A facile and new method for the synthesis of α-aryl-N-methylnitrones in solvent-free media using silica gel-NaOH
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Substituted α-aryl-N-methylnitrones are prepared by the condensation reaction of N-methylhydroxylamine hydrochloride and benzaldehydes in solvent-free media using silica-gel-NaOH catalyst system. The yields are excellent regardless of the electron-donatin
- Alavi Nikje,Bigdeli,Imanieh
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p. 1465 - 1468
(2007/10/03)
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- An efficient and rapid chemoselective synthesis of α-Aryl-N-methylnitrones in dry media
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A simple, efficient, and eco-friendly procedure was developed for the condensation of N-methylhydroxylamine hydrochloride with benzaldehydes bearing electron-donating or electron-withdrawing substituents in the presence of powdered molecular sieves (3 A)
- Bigdeli,Nikje
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p. 1547 - 1549
(2007/10/03)
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- Oxidation of N-benzyl-N-methylhydroxylamines to nitrones. A mechanistic study
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Oxidation of various N-(o-, m-, p- substituted benzyl)- N-methylhydroxylamines has been carried out using mercury(II) oxide and p-benzoquinone (p-BQ) as oxidants. Hammett plots have been obtained with negative ρ values, showing the development of a positive centre in the transition state. The unstable E nitrones, which readily isomerize to the more stable Z nitrones, are obtained in appreciable quantities and in some cases as the major product. A considerable deuterium isotope effect is observed in the oxidation process. The overall picture of the mechanistic pathway involves electron transfer from nitrogen to the oxidant followed by hydrogen abstraction.
- Hassan, Azfar,Wazeer, Mohammed I. M.,Ali, Sk. Asrof
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p. 393 - 399
(2007/10/03)
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- Nitrogen inversion and N-O bond rotation processes in di- and tri-substituted hydroxylamines. A dynamic NMR study
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The barriers to inversion in several acyclic di- and tri-substituted hydroxylamines are determined by 1H NMR band shape analysis.The barriers range from 49.1 to 66.8 kJ mol1- and are discussed in terms of a conformational process which involves nitrogen inversion and rotation around the N-O bond.The N-benzyl group with an ortho hydroxy substituent increases the nitrogen inversion barrier by 10 kJ mol-1, which indicates the requirement of breaking of the intramolecular hydrogen bond prior to inversion.
- Ali, Sk. Asrof,Hassan, Azfar,Wazeer, Mohammed I. M.
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p. 1479 - 1484
(2007/10/03)
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