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Gatica E, Possetto D, Reynoso A, Natera J, Miskoski S, De Gerónimo E, Bregliani M, Pajares A, Massad WA. Photo-Fenton and Riboflavin-photosensitized Processes of the Isoxaflutole Herbicide. Photochem Photobiol 2018; 95:901-908. [PMID: 30403296 DOI: 10.1111/php.13047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Accepted: 10/30/2018] [Indexed: 01/01/2023]
Abstract
The proherbicide Isoxaflutole (IXF) hydrolyzes spontaneously to diketonitrile (DKN) a phytotoxic compound with herbicidal activity. In this work, the sensitized degradation of IXF using Riboflavin (Rf), a typical environmentally friendly sensitizer, Fenton and photo-Fenton processes has been studied. The results indicate that only the photo-Fenton process produces a significant degradation of the IXF. Photolysis experiments of IXF sensitized by Riboflavin is not a meaningful process, IXF quenches the Rf excited triplet (3 Rf*) state with a quenching rate constant of 1.5 · 107 m-1 s-1 and no reaction is observed with the species O2 (1 Δg ) or O 2 · - generated from 3 Rf*. The Fenton reaction produces no changes in the IXF concentration. While the photo-Fenton process of the IXF, under typical conditions, it produces a degradation of 99% and a mineralization to CO2 and H2 O of 88%. A rate constant value of 1.0 × 109 m-1 s-1 was determined for the reaction between IXF and HO˙. The photo-Fenton process degradation products were identified by UHPLC-MS/MS analysis.
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Affiliation(s)
- Eduardo Gatica
- Departamento de Estudios Básicos y Agropecuarios, Facultad de Agronomía y Veterinaria, UNRC, Río Cuarto, Cordoba, Argentina
| | - David Possetto
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina
| | - Agustina Reynoso
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina
| | - José Natera
- Departamento de Estudios Básicos y Agropecuarios, Facultad de Agronomía y Veterinaria, UNRC, Río Cuarto, Cordoba, Argentina.,Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina
| | - Sandra Miskoski
- Departamento de Estudios Básicos y Agropecuarios, Facultad de Agronomía y Veterinaria, UNRC, Río Cuarto, Cordoba, Argentina.,Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina
| | - Eduardo De Gerónimo
- Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria, Balcarce, Argentina
| | - Mabel Bregliani
- Instituto de Tecnología Aplicada (ITA), UARG-UNPA, Río Gallegos, Argentina
| | - Adriana Pajares
- Instituto de Tecnología Aplicada (ITA), UARG-UNPA, Río Gallegos, Argentina.,Departamento Ingeniería Química, FI, UNPSJB, Comodoro Rivadavia, Argentina
| | - Walter A Massad
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina
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Nobushige K, Hirano K, Satoh T, Miura M. Rhodium-catalyzed direct ortho-alkenylation of phenyl sulfones with alkynes utilizing sulfonyl function as modifiable directing group. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.046] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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