Fenvalerate

  • (RS)-alpha-cyano-3-Phenoxybenzyl (RS)-2-(4-chlorophenyl)-3-methylbutyrate
  • Cyano(3-phenoxyphenyl)methyl 4-chloro-alpha-(1-methylethyl)benzeneacetate
  • Cyano(3-phenoxybenzyl)methyl 2-(4-Chlorophenyl)-3-methylbutyrate
Formula
C25H22ClNO3
Structure
Description
A clear viscious yellow liquid with a mild odor.
Uses
Highly active contact insecticide effective against a wide range of pests, including strains resistant to organochlorine, organophosphorus, and carbamate insecticides. It controls insects that attack leaves or fruits on various crops, including cotton, fruit, vegetables and vines at 25-250 g aiha, and is persistent under various field conditions. It is also used in public health and animal husbandry, controlling flies in cattle sheds for 60 days at 100 mgsq m wall, and is effective against boophilus at 200-300 mgl.

Registry Numbers and Inventories.
CAS
51630-58-1
EC (EINECS/ELINCS)
257-326-3
RTECS
CY1576350
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
2902
Merck
12,4051
Beilstein/Gmelin
2025982
EPA OPP
296700
Swiss Giftliste 1
G-2857
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C25H22ClNO3
Formula mass
419.91
Melting point, °C
59-60
Boiling point, °C
539
Vapor pressure, mmHg
1E-11 (25 C)
Density
1.17 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.5533 (20 C)
Partition coefficient, pKow
4.42
Heat of vaporization
81.6 kJ/mol

Hazards and Protection.
Storage
Store in original containers away from food stuffs, animal feed. Pyrethrins with piperonyl butoxide topical preparations should be stored in well-closed containers at a temperature less than 40C, preferably between 15-30C.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
More stable in acidic solution than in alkaline solution. Are stable for long periods in water-based aerosols where emulsifiers give neutral water systems.
Incompatibilities
Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products Incompatible with acids; mixing nitriles with strong oxidizing acids can lead to extremely violent reactions Incompatible with other oxidizing agents such as peroxides and epoxides.
Decomposition
Hydrogen cyanide may be formed during thermal decomposition.

Fire.
Flash Point,°C
280
Fire fighting
Use carbon dioxide, foam, or dry chemical on fires involving pyrethroids.
Fire potential
Pyrethrins. Burn with difficulty.
Combustion products
Hydrogen cyanide may be formed during thermal decomposition.

Health.
Poison_Class
3
Exposure effects
   Ingestion
Nausea, vomiting and abdominal pain commonly occur and develop within 10 to 60 minutes following ingestion.
   Inhalation
Hypersensitivity reactions characterized by pneumonitis, cough, dyspnea, wheezing, chest pain, and bronchospasm may occur. Rare cases of respiratory failure and cardiopulmonary arrest have been reported.
   Skin
Irritant and contact dermatitis may develop. Erythema which mimics sunburn has also been noted after prolonged repeated exposure.
   Eyes
A stuffy, runny nose and scratchy throat following inhalational exposure may be noted.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. Vitamin e topical application is highly effective in relieving paresthesias.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2902
Response guide
Hazard class
6.1
Packing Group
I; II; III