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Title: Pirimiphos-methyl  
Author: World Heritage Encyclopedia
Language: English
Subject: Ethoprop, Chlorethoxyfos, Dicrotophos, Fenamiphos, Phosmet
Publisher: World Heritage Encyclopedia


IUPAC name
O-[2-(Diethylamino)-6-methylpyrimidin-4-yl] O,O-dimethyl phosphorothioate
Other names
ChemSpider  N
Jmol-3D images Image
Molar mass 305.33 g·mol−1
Appearance Straw-colored liquid
Density 1.147 g/mL (30 °C)
Melting point 15 to 18 °C (59 to 64 °F; 288 to 291 K)
Boiling point decomposes before boiling
5.0 mg/L (30 °C)
Harmful (Xn), Dangerous for the environment(N)
R-phrases R50/53
S-phrases (S2), S60, S61
Flash point 46 °C (115 °F; 319 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: YesY/N?)
Organophosphate insecticide with pirimiphos-methyl (no longer in production)

Pirimiphos-methyl is a phosphorothioate used as an insecticide. It was originally developed by Imperial Chemical Industries Ltd., now Syngenta, in 1967.[1]

This is one of several compounds used for vector control of Triatoma. These insects are implicated in the transmission of Chagas disease in the Americas.[2] Pirimiphos-methyl can be applied as an interior surface paint additive, in order to achieve a residual pesticide effect.

Pyrimiphos-ethyl is a related insecticide in which the methyl groups are replaced with ethyl groups.


  1. ^ [1]
  2. ^ CHAPTER 3: Triatomine bugs, Vectors of Chagas disease, World Health Organization

External links

  • Pirimiphos-methyl in the Pesticide Properties DataBase (PPDB)

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