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IUPAC name
O-[2-(Diethylamino)-6-methylpyrimidin-4-yl] O,O-dimethyl phosphorothioate
Other names
3D model (JSmol)
ECHA InfoCard 100.045.011
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R-phrases (outdated) R22, R50/53
S-phrases (outdated) (S2), S60, S61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).
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Infobox references
Organophosphate insecticide with pirimiphos-methyl (no longer in production)

Pirimiphos-methyl, marketed as Actellic,[1][2][3][4] and Sybol is a phosphorothioate used as an insecticide. It was originally developed by Imperial Chemical Industries Ltd., now Syngenta, in 1967.[5]

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.[6] 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. ^ "Actellic50EC". www3.syngenta.com. Retrieved 2015-11-11.
  2. ^ "Common Chemistry - Substance Details - 29232-93-7 : Phosphorothioic acid, O-[2-(diethylamino)-6-methyl-4-pyrimidinyl]O,O-dimethyl ester". www.commonchemistry.org. Retrieved 2015-11-11.
  3. ^ "Actellic 50 EC". www3.syngenta.com. Retrieved 2015-11-11.
  4. ^ "ACTELLIC 50 EC: FIŞA CU DATE DE SECURITATE" (PDF) (in Romanian). Syngenta. 2013. Archived from the original (PDF) on 2016-09-10. Retrieved 2015-11-11.
  5. ^ "syngenta: Celebrating 75 years of scientific excellence at Jealott's Hill International Research Centre" (PDF). Archived from the original (PDF) on October 11, 2007. Retrieved June 26, 2012.
  6. ^ CHAPTER 3: Triatomine bugs, Vectors of Chagas disease, World Health Organization

External links[edit]