Permethrin

caption>Properties
olspan="2" align="center" bgcolor="#FFDEAD"|General
ame 3-phenoxybenzyl (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (IUPAC}
(3-phenoxyphenyl)methyl (1RS)-cis,trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate (CAS)
a href="/encyclopedia/Chemical-formula" title="Chemical formula">Chemical formula C21H20Cl2O3
a href="/encyclopedia/color" title="color">Appearance Colourless crystals
olspan="2" align="center" bgcolor="#FFDEAD"|Physical
a href="/encyclopedia/Atomic-weight" title="Atomic weight">Formula weight 391.28 amu
a href="/encyclopedia/Melting-point" title="Melting point">Melting point 307 K (34 °C)
a href="/encyclopedia/Boiling-point" title="Boiling point">Boiling point 473 K (200 °C)
a href="/encyclopedia/Density" title="Density">Density 1190 k/m3
a href="/encyclopedia/Crystal-structure" title="Crystal structure">Crystal structure  
a href="/encyclopedia/Solubility" title="Solubility">Solubility Insoluble (5.5 x 10-3 ppm
olspan="2" align="center" bgcolor="#FFDEAD"|Thermochemistry
a href="/encyclopedia/Standard-enthalpy-change-of-formation" title="Standard enthalpy change of formation">ΔfH0gas   kJ/mol
Delta;fH0liquid   kJ/mol
Delta;fH0solid   kJ/mol
a href="/encyclopedia/Standard-molar-entropy" title="Standard molar entropy">S0gas, 1 bar   J/mol·K
0liquid, 1 bar   J/mol·K
0solid   J/mol·K
olspan="2" align="center" bgcolor="#FFDEAD"|Safety
ngestion Harmless in small quantities
nhalation Harmful, potentially damaging to lungs
kin Irritation
yes Irritation
ore info Hazardous Chemical Database
olspan="2" align="center" bgcolor="#FFDEAD"| SI units were used where possible. Unless otherwise stated, standard conditions were used.

Disclaimer and references

Permethrin is a common chemical, widely used as an insecticide. It belongs to the family of chemicals called pyrethroids and functions as a neurotoxin, affecting neuron membranes by slowing the access of important sodium ions. In agriculture, Permethrin is mainly used on cotton, wheat, maize, and alfalfa crops, and is also used to kill parasites on chickens and other poultry. Its use is controversial since, as a broad-spectrum chemical, it kills indiscriminately; as well as the intended pests, it can harm beneficial insects including honey bees and small mammals such as mice. It is also used in healthcare, to eradicate parasites such as head lice and scabies, and in industrial and domestic settings to control pests such as ants and termites.

 

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