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Aqueous-Phase Oxidation of N-Substituted N-PhosphonomethylGlycines into Glyphosate with Hydrogen Peroxide in the Presence of Carbon-Supported Gold Catalysts Full article

Journal ChemistrySelect
, E-ISSN: 2365-6549
Output data Year: 2019, Volume: 4, Number: 36, Pages: 10756-10764 Pages count : 9 DOI: 10.1002/slct.201902625
Tags glyphosate synthesis; gold; N-substituted glyphosates; oxidation; supported catalysts
Authors Pyrjaev Pavel A. 1 , Yushchenko Dmitry Yu. 1 , Moroz Boris L. 1,2 , Pai Zinaida P. 1 , Bukhtiyarov Valerii I. 1,2
Affiliations
1 Boreskov Institute of Catalysis
2 Novosibirsk State University

Funding (1)

1 Russian Foundation for Basic Research 16-29-10691

Abstract: The catalytic performance of carbon‐supported gold nanoparticles has been studied for the oxidative dealkylation of a series of N‐substituted N‐phosphonomethyl glycines into N‐phosphonomethyl glycine (“glyphosate”) using dilute (0.11 m) aqueous H2O2 solution as oxidant. It was shown that the electron‐donating inductive (+I) effect of the hydrocarbon substituent at the nitrogen atom greatly influences both the substrate reactivity and product distribution. Gold nanoparticles of 1.5‐2.5 nm in diameter synthesized by “cationic adsorption” technique on the mesoporous Sibunit carbons, which are pre‐oxidized with HNO3 and containing a lot of surface acidic groups, were found to catalyze the formation of glyphosate from N‐isopropyl‐N‐phosphonomethyl glycine at 70 °C with selectivity up to 94% at 98% substrate conversion. Oxidation of other substrates containing the substituents with a weaker +I effect than that of iPr group resulted a large amount of undesirable N‐decarboxymethylation product in addition to glyphosate. Considering the literature data and our own experimental results, assumptions about the reaction mechanism and causes of the observed trends are made.
Cite: Pyrjaev P.A. , Yushchenko D.Y. , Moroz B.L. , Pai Z.P. , Bukhtiyarov V.I.
Aqueous-Phase Oxidation of N-Substituted N-PhosphonomethylGlycines into Glyphosate with Hydrogen Peroxide in the Presence of Carbon-Supported Gold Catalysts
ChemistrySelect. 2019. V.4. N36. P.10756-10764. DOI: 10.1002/slct.201902625 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: Jul 15, 2019
Accepted: Sep 4, 2019
Published online: Sep 24, 2019
Published print: Sep 30, 2019
Identifiers:
Web of science: WOS:000488160100022
Scopus: 2-s2.0-85073226179
Elibrary: 41683876
Chemical Abstracts: 2019:1867714
OpenAlex: W2976164902
Citing:
DB Citing
Web of science 5
Scopus 4
Elibrary 3
OpenAlex 3
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