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Permethrin

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Permethrin Basic information

Product Name:
Permethrin
CAS:
52645-53-1
MF:
C21H20Cl2O3
MW:
391.29
EINECS:
258-067-9
Mol File:
52645-53-1.mol
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Permethrin Chemical Properties

Melting point:
34-35°C
Boiling point:
bp0.05 220°
Density 
1.19
vapor pressure 
7×10-5 Pa (20 °C)
refractive index 
1.6500 (estimate)
Flash point:
10 °C
storage temp. 
0-6°C
form 
neat
Water Solubility 
insoluble
Merck 
13,7257
BRN 
5765325
Stability:
Stable. Incompatible with strong oxidising agents.
InChIKey
RLLPVAHGXHCWKJ-UHFFFAOYSA-N
CAS DataBase Reference
52645-53-1(CAS DataBase Reference)
NIST Chemistry Reference
Permethrin(52645-53-1)
EPA Substance Registry System
Permethrin (52645-53-1)
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Safety Information

Hazard Codes 
Xn,N,T,F
Risk Statements 
20/22-43-50/53-39/23/24/25-23/24/25-11-51/53-36-20/21/22
Safety Statements 
13-24-36/37/39-60-61-45-36/37-16-7-26
RIDADR 
UN1230 3/PG 2
WGK Germany 
3
RTECS 
GZ1255000
HS Code 
29162090
Hazardous Substances Data
52645-53-1(Hazardous Substances Data)
Toxicity
LD50 orally in female rats: 3801 mg/kg (Metker); LD50 in 8 day old rats, male adult rats (mg/kg): 340.5, 1500.0 orally (Cantalamessa)
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Permethrin Usage And Synthesis

Description

Yellow-brown to brown liquid, which sometimes tends to crystallize at room temperature (technical grade).

Chemical Properties

Crystalline Solid

Uses

Permethrin is a synthetic pyrethroid active against lice, ticks, mites, and fleas. It acts on neural cellmembranes, delaying repolarization and causing paralysis. The compound has no reported adverse properties, is heat and light stable, has 70% to 80% ovicidal activity, and leaves an active residue on the scalp. Permethrin is 26 times less toxic than lindane and 3 times less toxic than pyrethrins. A 1% permethrin cream rinse (Nix) preparation with a single application was determined to be more effective than treatment with RID. Permethrin-treated military uniforms are effective against human body lice. Apply the cream rinse for 10 minutes and rinse off with water. Localized pruritus may be reported with use of this product.

Uses

Labelled Permethrin (P288500). Synthetic pyrethroid insectide, more stable to light and at least as active as the natural pyrethrins and with low mammalian toxicity.

Uses

For the treatment of infestation with Sarcoptes scabiei (scabies); antihyperlipidemic; cholesterol sequestrant.

Definition

ChEBI: A cyclopropanecarboxylate ester in which the esterifying alcohol is 3-phenoxybenzyl alcohol and the cyclopropane ring is substituted with a 2,2-dichlorovinyl group and with gem-dimethyl groups.

brand name

Elimite (Allergan); Nix (GlaxoSmithKline).

General Description

Pale brown liquid. Relatively water insoluble. Used as an insecticide.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

A pyrethroid derivative.

Contact allergens

Pyrethroids, also called pyrethrinoids, are neurotoxic synthetic compounds used as insecticides, with irritant properties. Cypermethrin and fenvalerate have been reported as causing positive allergic patch tests, but only fenvalerate was relevant in an agricultural worker.

Clinical Use

Permethrin is 3-(2,2-Dichloroethenyl)-2,2-dimethylcyclopropanecarboxylicacid (3-phenoxyphenyl)methylester or 3-(phenoxyphenyl)methyl (±)-cis, trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate(Nix). This synthetic pyrethrinoid compound is more stablechemically than most natural pyrethrins and is at least as activeas an insecticide. Of the four isomers present, the1(R),trans and 1(R),cis-isomers are primarily responsiblefor the insecticidal activity. The commercial product is amixture consisting of 60% trans and 40% cis racemic isomers.It occurs as colorless to pale yellow low-melting crystalsor as a pale yellow liquid and is insoluble in water butsoluble in most organic solvents.
Permethrin exerts a lethal action against lice, ticks, mites,and fleas. It acts on the nerve cell membranes of the parasitesto disrupt sodium channel conductance. It is used as apediculicide for the treatment of head lice. A single applicationof a 1% solution effects cures in more than 99% ofcases. The most frequent side effect is pruritus, which occurredin about 6% of the patients tested.

Safety Profile

Poison by inhalation, intravenous, and intracerebral routes. Moderately toxic by ingestion. Experimental reproductive effects. Mutation data reported. A skin irritant. When heated to decomposition it emits toxic fumes of Cl-. See also ESTERS

Veterinary Drugs and Treatments

Permethrin is synthetic pyrethroid that acts as an adulticide insecticide/miticide. It has knockdown activity against fleas, lice, ticks, and certain mites (e.g., Cheyletiella, Sarcoptes scabiei) and also has repellant activity. In small animal medicine, it is used primarily for fleas and ticks on dogs. In large animal and food animal medicine, there are many products (not listed below) available for pour-on, dusting, and spray use for flies, lice, mites, mosquitoes, ticks and keds.
Permethrin acts by disrupting the sodium channel current in arthropod nerve cell membranes, resulting in paralysis and death.

Environmental Fate

Soil. Permethrin biodegraded rapidly via hydrolysis yielding 3-(2,2-dichloroethenyl)- 2,2-dimethylcyclopropanecarboxylic acid and 3-phenoxybenzyl alcohol (Kaufman et al., 1981). The reported half-life in soil containing 1.3–51.3% organic matter and pH 4.2–7.7 is <38 days (Worthing and Hance, 1991)
In lake water, permethrin degraded more rapidly than in flooded sediment to transand cis-(dichlorovinyl)dimethylcyclopropanecarboxylic acid. The cis isomer was more stable toward biological and chemical degradation than the trans isomer (Sharom and Solom
Plant. Metabolites identified in cotton leaves included trans-hydroxypermethrin, 2′- hydroxypermethrin, 4′-hydroxypermethrin, dichlorovinyl acid, dichlorovinyl acid conjugates, hydroxydichlorovinyl acid, hydroxydichlorovinyl acid conjugates, phe
Dislodgable residues of permethrin on cotton leaves 0, 24, 48, 72 and 96 hours after application (1.1 kg/ha) were (cis:trans): 0.26:0.38, 0.24:0.34, 0.22:0.32, 0.16:0.24 and 0.15:0.21 μg/m2, respectively (Buck et al., 1980).
Photolytic. Photolysis of permethrin in aqueous solutions containing various solvents (acetone, hexane and methanol) under UV light (λ >290 nm) or on soil in sunlight initially resulted in the isomerization of the cyclopropane moiety and ester cl

Metabolic pathway

Permethrin was one of the first photostable pyrethroids suitable for field use.It served as a precursor for others such as its α-cyano analogue, cypermethrin. As it lacks the cyano group it has no chirality at the acarbon atom and therefore consists of a mixture of only four isomers. It is hydrolysed more readily than cypermethrin because it is an ester of a primary alcohol.
Much of the early research on the metabolism of the synthetic, photostable pyrethroids was conducted by Casida and co-workers on permethrin. The published results greatly assisted subsequent work on the analogues. This is stressed because some of the information reported below will draw on the metabolic schemes given in the cypermethrin entry.
The environmental fate of permethrin and its metabolism in plants, insects, animals and fish have been reported. The insecticide is metabolised by ester cleavage to its constituent acid and alcohol and subsequent conjugation of these. The primary metabolites are also subject to oxidation prior to conjugation. Permethrin itself is also subject to oxidation, the cisisomers more so than the trans-isomers because the former is more slowly hy droly sed.

Degradation

Permethrin is stable as a solid but it is readily hydrolysed in solution under alkaline conditions; it is most stable at pH 4. It is relatively resistant to photodegradation in the context of field use but it undergoes facile photoisomerism (Holmstead et al., 1978). It can be degraded under laboratory conditions affording DCVA (2) and 3-phenoxybenzyl alcohol (3PBAlc, 3). Under appropriate conditions, trans-permethrin affords 29% trans-DCVA and 13% cis-DCVA. The mechanisms of these reactions have been reviewed in detail by Ruzo (1982). Permethrin is resistant to photo-oxidation; other reactions, such as dechlorination, are of minor importance. The degradation products are shown in Scheme 1.

Toxicity evaluation

Acute oral LD50 for rats: 430-4,000 mg/kg (cis:trans ca. 40:60); ca. 6,000 mg/kg (cis:trans ca. 20:80)

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Zhuhai JiaYi Biological Technology Co., Ltd. Gold
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18578209868 QQ2355327026
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Qi Qi hang Biotechnology Co., Ltd. Gold
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Guangzhou Hongcheng Biotechnology Co., Ltd Gold
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NANJING BANGNUO BIOTECHNOLOGY CO., LTD Gold
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belovelife2010@foxmail.com
Aikon International Limited Gold
Tel:
025-66113011
Email:
hywu@aikonchem.com
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