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Insecticides and acaricides

Pyrethrin I

Also known as Piretrina 1, Chrysanthemum monocarboxylic acid pyrethrolone ester, (+)-Pyrethronyl (+)-trans-chrysanthemate

CAS 121-21-1Formula C21H28O3Molar mass 328.45 g/molEC 204-455-8
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 1 supplier listed
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Pyrethrin I chemical structure, C21H28O3, CAS 121-21-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Viscous liquid
Boiling point
170 °C
Density
1.5192 g/cm³ at 18 °C
Solubility
In water, 0.2 mg/L (temperature not specified)
HS code
291620
Category
Insecticides and acaricides
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Pyrethrin I?

Plain description, key identifiers and synonyms

Pyrethrin I is a member of pyrethrins. It is functionally related to a (Z,S)-pyrethrolone.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cis-[(1S)-2-methyl-4-oxo-3-[(2Z)-penta-2,4-dienyl]cyclopent-2-en-1-yl] (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropane-1-carboxylate
CAS number
121-21-1 CAS number cross-checked
EC number
204-455-8
Molecular formula
C21H28O3
UNII
T018I9EQOL
InChIKey
ROVGZAWFACYCSP-VUMXUWRFSA-N
InChI
InChI=1S/C21H28O3/c1-7-8-9-10-15-14(4)18(12-17(15)22)24-20(23)19-16(11-13(2)3)21(19,5)6/h7-9,11,16,18-19H,1,10,12H2,2-6H3/b9-8-/t16-,18+,19+/m1/s1
Canonical SMILES
C=CC=CCC1=C(C)C(OC(=O)C2C(C=C(C)C)C2(C)C)CC1=O
Isomeric SMILES
CC1=C(C(=O)C[C@@H]1OC(=O)[C@@H]2[C@H](C2(C)C)C=C(C)C)C/C=C\C=C

Synonyms

  • Piretrina 1
  • Chrysanthemum monocarboxylic acid pyrethrolone ester
  • (+)-Pyrethronyl (+)-trans-chrysanthemate
  • [(1S)-2-methyl-4-oxo-3-[(2Z)-penta-2,4-dienyl]cyclopent-2-en-1-yl] (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropane-1-carboxylate
  • Pyrethrolone, chrysanthemum monocarboxylic acid ester
  • 2-Methyl-4-oxo-3-(2,4-pentadienyl)-2-cyclopenten-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropane carboxylate
  • Cyclopropaneacrylic acid, 2,2-dimethyl-3-(2-methylpropenyl)-, ester with 4-hydroxy-3-methyl-2-(2,4-pentadienyl)-2-cyclopenten-1-one
  • Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, (1S)-2-methyl-4-oxo-3-(2Z)-2,4-pentadienyl-2-cyclopenten-1-yl ester, (1R,3R)-
  • Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, 2-methyl-4-oxo-3-(2,4-pentadienyl)-2-cyclopenten-1-yl ester, (1R-(1alpha(S*(Z)),3beta))-
  • (1S)-2-methyl-4-oxo-3-[(2Z)-penta-2,4-dien-1-yl]cyclopent-2-en-1-yl (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropanecarboxylate
  • ((1S)-2-methyl-4-oxo-3-((2Z)-penta-2,4-dienyl)cyclopent-2-en-1-yl) (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropane-1-carboxylate
  • (1S)-2-methyl-4-oxo-3-((2Z)-penta-2,4-dien-1-yl)cyclopent-2-en-1-yl (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropanecarboxylate
  • (1S)-2-methyl-4-oxo-3-((2E)-penta-2,4-dien-1-yl)cyclopent-2-en-1-yl (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropane-1-carboxylate
  • Pyrethrin 1
  • Pyrethrine I
  • Pyrethrine I [ISO-French]
  • Bubil (TN)
  • 3-09-00-00215 (Beilstein Handbook Reference)
  • Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methylpropenyl)-, ester with 4-hydroxy-3-methyl-2-(2,4-pentadienyl)-2-cyclopenten-1-one
  • (1S)-2-methyl-4-oxo-3-[(2Z)-penta-2,4-dien-1-yl]cyclopent-2-en-1-yl (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropane-1-carboxylate
  • 2,2-Dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid 2-methyl-4-oxo-3-(2,4-pentadienyl)-2-cycloenten-1-yl ester
  • Pyrethrin 1 100 microg/mL in Cyclohexane
  • (1S)-2-Methyl-4-oxo-3-(2Z)-2,4-pentadienylcyclopenten-1-yl (1R,3R)-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylate
  • (Z)-(S)-2-Methyl-4-oxo-3-(penta-2,4-dienyl)cyclopent-2-enyl (+)-trans-chrysanthemate
  • (Z)-(S)-2-Methyl-4-oxo-3-(penta-2,4-dienyl)cyclopent-2-enyl (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecarboxylate
Show all 28 synonyms
  • [(1S)-2-methyl-4-oxo-3-[(2Z)-penta-2,4-dienyl]cyclopent-2-en-1-yl] (1R,3R)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecarboxylate
  • 2-Methyl-4-oxo-3-(penta-2,4-dienyl)cyclopent-2-enyl (1R-(1alpha(S*(Z)),3beta))-chrysanthemate
  • Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, 2-methyl-4-oxo-3-(2,4-pentadienyl)-2-cyclopenten-1-yl ester, (1theta-(1alpha(S(Z)),3beta))-

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Viscous liquidexp.
Boiling point
170 °Cexp.
Density
1.5192 g/cm³ at 18 °Cexp.
Solubility
In water, 0.2 mg/L (temperature not specified)exp.
Vapour pressure
2.03 × 10⁻⁵ mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
328.45 g/molcalc.
Exact mass
328.2038 Dacalc.
LogP (octanol/water)
4.56calc.
Topological polar surface area
43.37 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
6calc.
Heavy atoms
24calc.
Rings
2calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.52calc.
Formal charge
0calc.
Stereocentres
3calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1C=CC(OC(=O)C2CC2)C1

O=C1C=CC(OC(=O)C2CC2)C1

2 rings, 12 atoms.

55 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (15)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Pyrethrin I suppliers

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Pyrethrin I price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Pyrethrins are botanical insecticides ... used in these four general ways: (i) pre-harvest and postharvest uses on many agricultural crops, (ii) direct and indirect treatments of livestock animals and premises, (iii) treatments of commercial and industrial facilities and storage areas where raw and processed food/feed commodities are stored or processed, and (iv) wide area mosquito abatement use in areas which include aquatic areas. (Pyrethrins).

Because of their safety, pyrethrum extracts are used extensively in stock sprays, aerosols, industrial sanitation sprays, and to protect stored food in warehouses. (Pyrethrins).

Control of a wide range of insects and mites in public health, stored products, animal houses, and on domestic and farm animals. Control of chewing and sucking insects and spider mites ... Personal insect repellents and for human head lice control. (Pyrethrins).

Household insecticide (as a component of pyrethrins).

Use classes: Pesticides.

How it is made

Pyrethrum extract contains six closely related insecticidal esters ... The six individual esters are not available commercially and are more economically produced as botanicals than by chemical manufacture.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 613-023-00-1

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Pyrethrin I is traded under.

HS 2916.20Indicative HS code

Cyclanic, cyclenic or cycloterpenic monocarboxylic acids, their anhydrides, halides…

World exports in 2024
$489M
−6.1% vs 2023, imports $608M
2019 to 2024
Top exporters
  1. China45.5%
  2. India * partner reported18.6%
  3. Japan11.2%
Top importers
  1. Brazil20.3%
  2. United States15.7%
  3. India * partner reported12.8%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Pyrethrin I is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyrethrin I, based on the data on this page

What is Pyrethrin I?

Pyrethrin I is a member of pyrethrins. It is functionally related to a (Z,S)-pyrethrolone.

What is the CAS number of Pyrethrin I?

The CAS registry number of Pyrethrin I is 121-21-1.

What is the molecular formula and weight of Pyrethrin I?

The molecular formula of Pyrethrin I is C21H28O3 and its molar mass is 328.45 g/mol.

What is Pyrethrin I used for?

Pyrethrins are botanical insecticides ... used in these four general ways: (i) pre-harvest and postharvest uses on many agricultural crops, (ii) direct and indirect treatments of livestock animals and premises, (iii) treatments of commercial and industrial facilities and storage areas where raw and processed food/feed…

Is Pyrethrin I hazardous?

Pyrethrin I carries the GHS signal word "Warning". Main hazards: harmful if swallowed, harmful in contact with skin, harmful if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrethrin I?

Pyrethrin I is usually classified under HS code 291620 (Cyclanic, cyclenic or cycloterpenic monocarboxylic acids, their anhydrides, halides…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrethrin I?

CompoundList lists 1 supplier of Pyrethrin I in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Pyrethrin I?

Suppliers quote Pyrethrin I on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Pyrethrin I

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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