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Temephos (CAS 3383-96-8) | ChemAbout

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Selective herbicide for cereals

Referencesame scaffold

I+/--Oxo-2-(phenylthio)benzenepropanoic acid

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5-(1-Carboxyethyl)-2-(phenylthio)phenylacetic acid

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Related Reading

Why Does One Chemical Intermediate End Up in Dozens of Pesticides? Inside the Reaction Interface Economy

A single pyridine intermediate feeds four different neonicotinoid insecticides. A single pyrazole acid feeds a whole family of SDHI fungicides. This isn't coincidence — it's the Reaction Interface Economy, the organizing logic behind modern agrochemical R&D and its supply chain.

Sourcing Temephos?

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C₁₆H₂₀O₆P₂S₃

466.5 g/mol

AgrochemicalDanger

Temephos

CAS3383-96-8EC222-191-1

Category

Agrochemical

Compound Class

Other

Primary Use

larvicide for mosquitoes and black flies

Temephos is an organophosphate insecticide used primarily to control larval stages of mosquitoes and black flies. It appears as a white crystalline solid or liquid above 87 °F, and the technical grade is a viscous brown liquid.

larvicide for mosquitoes and black fliescontrol of midge larvae in lakes, ponds, and wetlandscontrol of fleas on dogs and cats and lice on humans

Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.

Safety Reference

Toxic

Harmful

Health Hazard

Environmental Hazard

Danger

H302Harmful if swallowed

H311

Customs Tariff Classification

The international HS code for Temephos (CAS 3383-96-8) is 2930.90.

HS code (international, 6-digit)

2930.90

EU CN code (8-digit)

2930 90 95

Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.

Identifiers

IUPAC Name

[4-(4-dimethoxyphosphinothioyloxyphenyl)sulfanylphenoxy]-dimethoxy-sulfanylidene-lambda5-phosphane

InChIKey

WWJZWCUNLNYYAU-UHFFFAOYSA-N

SMILES

COP(=S)(OC)OC1=CC=C(C=C1)SC2=CC=C(C=C2)OP(=S)(OC)OC

Synonyms (67)

Toxic in contact with skin

H312Harmful in contact with skin

H332Harmful if inhaled

H372Causes damage to organs through prolonged or repeated exposure

H400Very toxic to aquatic life

H410Very toxic to aquatic life with long lasting effects

H320Causes eye irritation

H371May cause damage to organs

H303May be harmful if swallowed

H316Causes mild skin irritation