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A simple method for the preparation of desmethyl derivatives of some organophosphorus insecticides


Desmethyl derivatives of a variety of 0-aryl-0′,0′'dimethyl phosphorothionate organophosphorus insecticides can be prepared from the parent insecticides by treatment with potassium bromide and with a stream of nitrogen bubbling through the reaction mixture. The yields are low and we have made no attempt to optimise them, but we feel that this disadvantage is outweighed by three factors: (i) the starting materials are readily available and cheap, (ii) the reaction is clean and simple, and (iii) the procedure does not involve malodorous compounds.

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Chambers, J., Matthews, W.A. A simple method for the preparation of desmethyl derivatives of some organophosphorus insecticides. Bull. Environ. Contam. Toxicol. 18, 326–330 (1977).

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  • Methyl Iodide
  • Dimethoate
  • Fenitrothion
  • Sodium Iodide
  • Organophosphorus Insecticide