Issue 39, 2020

Microwave-assisted nucleophilic degradation of organophosphorus pesticides in propylene carbonate

Abstract

Propylene carbonate is becoming a suitable green alternative to volatile organic solvents in the study of chemical reactions. In this study, an efficient method for nucleophilic degradation of five organophosphorus pesticides, fenitrothion, malathion, diazinon, parathion, and paraoxon, using propylene carbonate as a solvent is proposed. The effect of changing the nature of the nucleophile and the influence of microwave (MW) heating were investigated. A screening of temperatures (50 °C–120 °C) was performed under microwave heating. The pesticide degradation was followed by 31P NMR, and the extent of conversion (%) was calculated by the integration of phosphorus signals. Keeping in mind that recently it has been reported that some ionic liquids play a nucleophilic role, in this work we report for the first time the degradation of organophosphorus pesticides by using an amino acid-based ionic liquid such as Bmim[Ala] as a nucleophile and a bio-based solvent (propylene carbonate) as a reaction medium in combination with microwave heating.

Graphical abstract: Microwave-assisted nucleophilic degradation of organophosphorus pesticides in propylene carbonate

Supplementary files

Article information

Article type
Paper
Submitted
05 Сер 2020
Accepted
18 Вер 2020
First published
21 Вер 2020

Org. Biomol. Chem., 2020,18, 7868-7875

Microwave-assisted nucleophilic degradation of organophosphorus pesticides in propylene carbonate

D. Millán, M. Rojas, R. A. Tapia and P. Pavez, Org. Biomol. Chem., 2020, 18, 7868 DOI: 10.1039/D0OB01620A

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