- Preparation method of nitrogen-containing aromatic dicarboxylic acid
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The invention discloses a preparation method of nitrogen-containing aromatic dicarboxylic acid. The method includes: taking quinoline, isoquinoline, benzimidazole or benzotriazole and a derivative thereof as the raw materials, adopting oxone as the oxidant, employing a metal salt as the catalyst and using inorganic acid as the medium, adding a phase transfer reagent, and carrying out reaction to obtain nitrogen-containing aromatic dicarboxylic acid. The reagents used by the method are high in stability, convenient for transportation and storage, the operation is simple, the conditions are easily controllable, and the price is low, at the same time, the catalytic effect is good, the yield is high, and waste liquid treatment is easy, therefore the method is convenient for industrial large-scale production.
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Paragraph 0097-0098
(2020/03/02)
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- MnO2/TiO2 catalyzed synthesis of coenzyme pyridoxamine-5′-phosphate analogues: 3-deoxypyridoxamine-5′-phosphate
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The highly efficient-selective synthetic route of the pyridoxal-5′-phosphate (vitamin B6, PLP) analogues: C3 substituted deoxy derivatives of pyridoxal (PL), pyridoxal-N-oxide (PLNO), pyridoxamine (PM), pyridoxamine-5′-phosphate (PMP) and pyridoxal-5′-phosphate (PLP), were developed via reduction and followed by selective oxidation in one pot using solid supported nanoparticles. The salient features of this strategy are: economic two-fold conversion, more Lewis acid sites, vacancies on the nanoparticle surfaces, and good yields of 3-deoxypyridoxal and 3-deoxypyridoxamine-5′-phosphate.
- Abbas, Sk Jahir,Ramacharyulu,Ke, Shyue-Chu
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p. 10242 - 10248
(2016/02/05)
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- On the formation of niacin (vitamin B3) and pyridine carboxylic acids in interstellar model ices
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The formation of pyridine carboxylic acids in interstellar ice grains was simulated by electron exposures of binary pyridine (C5H5N)-carbon dioxide (CO2) ice mixtures at 10 K under contamination-free ultrahigh vacuum condi
- McMurtry, Brandon M.,Turner, Andrew M.,Saito, Sean E.J.,Kaiser, Ralf I.
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p. 173 - 184
(2016/06/13)
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- Directed lithiation of unprotected pyridinecarboxylic acids
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The lithium salts of 2-, 3- and 4-pyridinecarboxylic acids undergo deprotonation at the position adjacent to the carboxylate group when treated with LTMP in THF at 0 °C, -50 °C and -25 °C, respectively. The lithiation conditions could be extended to chlor
- Mongin, Florence,Trecourt, Francois,Queguiner, Guy
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p. 5483 - 5486
(2007/10/03)
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- ANODIC OXIDATION OF METHYL-SUBSTITUTED NITROGEN-CONTAINING HETEROCYCLIC COMPOUNDS AT THE ACTIVATED NICKEL OXIDE ELECTRODE
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Methyl derivatives of several nitrogen-containing heterocyclic compounds were converted into the corresponding carboxylic acids by means of electrochemical oxidation at the nickel oxohydroxide anode in alkaline medium, using a nondiaphragm electrolyzer.The oxidation of 2,5-dimethylpyrazine was used to demonstrate the effect of adding chromium (III) and cobalt (II) compounds to the reaction mixture.The composition and electronic state of the anode surface were studied using x-ray diffraction and XPS methods.
- Feldman, D.,Chervenka, M.,Stokh, E.,Shimanska, M.,Khaber, E.
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- Aza- and Diazaannulenones. Influence of Nitrogen Position on Their Reactivity and Stability
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Three new elusive intermediates, 3-aza-2,4-cyclopentadienone, 2,5-diaza-2,4-cyclopentadienone, and 3,4-diaza-2,4-cyclopentadienone, are reported.The three species can act either as dienes or as dienophiles in Diels-Alder reactions.The influence of the number and position of nitrogen atoms on their stability is studied.
- Gavina, Francisco,Costero, Ana M.,Andreu, M. Rosario,Ayet, M. Dolores
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p. 5417 - 5421
(2007/10/02)
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- Stabilized radiolabelled compounds
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A stabilizer for radioactively labelled organic compounds has the general formula STR1 where R is C1 to C4 alkylene which may be OH substituted, m is 0 or 1 (i.e. R may be absent or present), X is carboxyl or sulphonyl e.g. COOH or SO3 H or a salt thereof and n is 1, 2 or 3. Radiolabelled compounds of biological origin, such as nucleotides and amino acids, may be stabilized either in solution or in the freeze-dried state. For example, L-[35 S]methionine may be stabilized to prevent formation of a 47 KD band in protein transcription/translation experiments.
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