Alphamethrin

Description

Alphamethrin · CAS 65731-84-2 · C22H19Cl2NO3. UNII 2TF5M1O25X. Boiling Point: 200 °C @ 0.07 mm Hg; Melting Point: 78-81 °C; Solubility: In water, 0.01 mg/l @ 25 °C..

Identification

CAS Registry Number	65731-84-2
PubChem CID	93357
Molecular formula	C22H19Cl2NO3
IUPAC name	trans-[(S)-cyano-(3-phenoxyphenyl)methyl] (1R,3R)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate
UNII (FDA)	2TF5M1O25X

Computed Descriptors

Molecular Weight	416.3
XLogP3	6
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	7
Exact Mass	415.0741989
Monoisotopic Mass	415.0741989
Topological Polar Surface Area	59.3
Heavy Atom Count	28
Formal Charge	0

Physical & Chemical Properties

Boiling Point	200 °C @ 0.07 mm Hg
Melting Point	78-81 °C
Solubility	In water, 0.01 mg/l @ 25 °C.
Density	1.28 g/ml @ 20 °C
Vapor Pressure	0.00000017 [mmHg]
Vapor Pressure	1.73X10-5 mm Hg @ 20 °C
LogP	log Kow= 6.94

Physical description & handling notes

• Viscous yellowish brown semisolid mass; Colorless solid; [HSDB] Technical product is solid; [IPCS] White to pale yellow powder; [MSDSonline]
• Viscous yellowish brown semisolid mass.
• Colorless crystals
• In acetone 620, dichloromethane 550, cyclohexane 515, ethyl acetate 440, chlorobenzene 420, acetophenone 390, o-xylene 350, hexane 7 (all in g/l, 25 °C). In maize oil 19-20, ethylene glycol <1 (both in g/kg at 20 °C).
• Soluble in chloroform, methylene chloride, and toluene; slightly soluble in petroleum ether and methanol.
• Very stable in neutral and acidic media. Hydrolyzed in strongly alkaline media. Thermally stable up to 220 °C. Field data indicate that in practice it is stable to air and light.

Regulatory Status

Regulatory & Food Contact	INSECTICIDE: Veterinary Drug JECFA ADI: 0-0.02 mg/kg bw TRS 925-JECFA 62/12 FAS 53-JECFA 62/91

GHS Hazard Classification

Reported hazard statements	H301, H335, H373, H400, H410, H332 (46%), H312 (100%), H315 (100%)

Documented Uses

• A highly active pyrethroid insecticide; Used to control a wide range of chewing and sucking insects in fruits, vegetables, vines, cereals, maize, cotton, rice, other crops, and forestry; Also used as insecticide for public health pests and animal ectoparasiticide; [HSDB]
• Not currently registered with the EPA for use in the US; [HSDB]
• Control of a wide range of chewing and sucking insects (particularly Lepidotera, Coleoptera, and Hemiptera) in fruit (including citrus), vegetables, vines, cereals, maize, beet, oilseed rape, potatoes, cotton, rice, soya beans, forestry, and other crops. Control of cockroaches, mosquitoes, flies, and other insect pests in public health; and flies in animal houses. Also used as an animal ectoparasiticide. Component of cypermethrin.
• Veterinary Drug -> INSECTICIDE -> JECFA Functional Classes
• Produced from 3-phenoxybenzaldehyde cyanohydrin + (1RS)-cis-3-(2,2-dichlorovinyl-2,2-dimethylcyclopropanecarboxylic acid by esterification.
• Non-phytotoxic when used as directed.

Synonyms

alpha-cypermethrin; Aeralfam; Alfoxylate; Ultimate; Alfazot; Bestox; Cismix; Contest; Dominex; Fastac; Mageos; Alphamethrin; Alfamethrin; Concord; ALPHACYPERMETHRIN; Fastac 10 EC

Frequently Asked Questions

What are the CAS number and molecular formula of Alphamethrin?

CAS 65731-84-2; molecular formula C22H19Cl2NO3; molecular weight — g/mol.

What other names is Alphamethrin known by?

alpha-cypermethrin, Aeralfam, Alfoxylate, Ultimate, Alfazot, Bestox.

What is the regulatory status of Alphamethrin?

Documented regulatory listings: INSECTICIDE: Veterinary Drug; JECFA ADI: 0-0.02 mg/kg bw; TRS 925-JECFA 62/12.

Is Alphamethrin classified as hazardous?

Hazard statements reported: H301, H335, H373, H400, H410.

What are the key physical properties of Alphamethrin?

Boiling Point: 200 °C @ 0.07 mm Hg; Melting Point: 78-81 °C; Solubility: In water, 0.01 mg/l @ 25 °C.; Density: 1.28 g/ml @ 20 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.