trans-Permethrin

Also known as: trans-Permethrin, trans-Permethrin solution, trans-permethrin (bsi,ansi,esa,ban), Isomericmix, MFCD00145431, m-phenoxybenzyl trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, (3-phenoxyphenyl)methyl (1R,3S)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate, EINECS 263-347-9

trans-Permethrin (CAS 61949-77-7) is a compound in the Esters category listed in the Jingsj chemical database. It has the molecular formula C21H20Cl2O3 and a molecular weight of 391.28800 g/mol. Key properties include a boiling point of 465.9ºC at 760 mmHg, a density of 1.293g/cm3 and a flash point of -18ºC. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H304 and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 61949-77-7
Jingsj CID: J-1992192-3
Molecular Formula: C₂₁H₂₀Cl₂O₃
Molecular Weight: 391.28800 g/mol
Category: Esters
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	465.9ºC at 760 mmHg
Density	1.293g/cm3
Flash Point	-18ºC
Exact Mass	390.07900
PSA	35.53000
LogP	6.11330
Refractive Index	1.615

GHS Safety & Compliance

Flammable / Irritant / Health Hazard / Environmental HazardSignal word: Danger

H225 — Highly flammable liquid and vapour
H304
H315 — Causes skin irritation
H336 — May cause drowsiness or dizziness
H410 — Very toxic to aquatic life with long lasting effects

Activity & Biological Data

Additional Information	[1]. Xiao X, et al. Exposure to permethrin promotes high fat diet-induced weight gain and insulin resistance in male C57BL/6J mice. Food Chem Toxicol. 2018 Jan;111:405-416. [2]. Smith LB, et al. CYP-mediated permethrin resistance in Aedes aegypti and evidence for trans-regulation. PLoS Negl Trop Dis. 2018 Nov 19;12(11):e0006933.

Frequently Asked Questions

What is the CAS number of trans-Permethrin?

The CAS number of trans-Permethrin is 61949-77-7.

What are the molecular formula and molecular weight of trans-Permethrin?

trans-Permethrin has molecular formula C21H20Cl2O3 and molecular weight 391.28800 g/mol.

Is trans-Permethrin hazardous?

trans-Permethrin has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H304; H315 — Causes skin irritation.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "trans-Permethrin (CAS 61949-77-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1992192-3 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.