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Insecticides and acaricides

Pyrrolidine

Also known as Tetrahydropyrrole, Azacyclopentane, Azolidine

CAS 123-75-1Formula C4H9NMolar mass 71.12 g/molEC 204-648-7
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Harmful or irritant 101 suppliers listed
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Pyrrolidine chemical structure, C4H9N, CAS 123-75-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless to pale yellow liq
Melting point
-57.8 °C
Boiling point
86.6 °C
Density
Relative density (water = 1): 0.85
Flash point
3 °C
HS code
293399
Category
Insecticides and acaricides
UN number
UN 1922

What is Pyrrolidine?

Plain description, key identifiers and synonyms

Pyrrolidine is a cyclic amine whose five-membered ring contains four carbon atoms and one nitrogen atom, the parent compound of the pyrrolidine family. It is a saturated organic heteromonocyclic parent, an azacycloalkane and a member of pyrrolidines. It is a conjugate base of a pyrrolidinium ion.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
pyrrolidine
CAS number
123-75-1 CAS number cross-checkedOther or deprecated CAS: 89014-29-9
EC number
204-648-7
Molecular formula
C4H9N
UNII
LJU5627FYV
MDL number
MFCD00005249
InChIKey
RWRDLPDLKQPQOW-UHFFFAOYSA-N
InChI
InChI=1S/C4H9N/c1-2-4-5-3-1/h5H,1-4H2
SMILES (canonical and isomeric)
C1CCNC1

Synonyms

  • Tetrahydropyrrole
  • Azacyclopentane
  • Azolidine
  • Tetramethylenimine
  • Butylenimine
  • Prolamine
  • Perhydropyrrole
  • 1-Azacyclopentane
  • Pyrrolidine ring
  • Pyrrole, tetrahydro-
  • Pyrrole, tetrahydro
  • Tetrahydro pyrrole
  • Tetramethyleneimine
  • pyrrolidin
  • pyrolidine
  • pyrollidine
  • pyrroldine
  • pyrrolodine
  • Pirrolidine
  • Pyrrollidine
  • (s)-pyrrolidine
  • 14-pyrrolidine
  • Pyrrolidine, FG
  • Pyrrolidine, 99%
  • Pyrrolidinepyrrolidine
Show all 34 synonyms
  • Pyrrolidine, >=99%
  • 1-Pyrrolidinobutyronitrile
  • 5-20-01-00162 (Beilstein Handbook Reference)
  • Tetrahydropyrrole (Pyrrolidine)
  • pyrrolidine LT phase at 135K
  • pyrrolidine LT phase at 205K
  • Pyrrolidine, distilled in glass
  • Pyrrolidine - HT phase at 165K
  • Pyrrolidine - HT phase at 207K

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
Colorless to pale yellow liqexp.
Odour
Unpleasant, ammoniacal odorexp.
Taste
POWERFUL, AMMONIACAL TASTEexp.
Melting point
-57.8 °Cexp.
Boiling point
86.6 °Cexp.
Density
Relative density (water = 1): 0.85exp.
Flash point
3 °Cexp.
Solubility
In water, 1.0 × 10⁺⁶ mg/L (miscible) at 20 °Cexp.
Vapour pressure
62.7 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
71.12 g/molcalc.
Exact mass
71.0735 Dacalc.
LogP (octanol/water)
0.37calc.
Topological polar surface area
12.03 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
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, C1CCNC1

C1CCNC1

1 ring, 5 atoms. This chemical is the scaffold itself.

22,348 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
321NFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
  • H332Harmful if inhaled.
Precautionary statements (28)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1922
Transport hazard class
3
Packing group
II

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

Pyrrolidine suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 101 suppliers
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Where suppliers are based

101 suppliers in 16 countries

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Pyrrolidine 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

Intermediate for pharmaceuticals, fungicides, insecticides, rubber accelerators, citrus decay control, curing agent for epoxy resins, inhibitor.

Useful in tobacco flavors.

Used in vulcanization accelerators.

Reported uses (ppm): (FEMA, 1994) [Table#361].

Industrial uses: Intermediate.

Functional uses

  • Flavouring and nutrient
  • Fragrance

How it is made

Reaction of 1,4-butanediol and ammonia over a dehydration catalyst

Usually prepared by reduction of pyrrole.

Pyrrolidine can be produced from butanediol and ammonia, e.g., over an aluminum thorium oxide catalyst at 300 °C or over a nickel catalyst at 200 °C and 20 MPa under hydrogenation conditions. It can also be produced from tetrahydrofuran and ammonia over aluminum oxide at 275-375 °C.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Pyrrolidine, based on the data on this page

What is Pyrrolidine?

Pyrrolidine is a cyclic amine whose five-membered ring contains four carbon atoms and one nitrogen atom, the parent compound of the pyrrolidine family. It is a saturated organic heteromonocyclic parent, an azacycloalkane and a member of pyrrolidines. It is a conjugate base of a pyrrolidinium ion.

What is the CAS number of Pyrrolidine?

The CAS registry number of Pyrrolidine is 123-75-1. Other or deprecated CAS numbers: 89014-29-9.

What is the molecular formula and weight of Pyrrolidine?

The molecular formula of Pyrrolidine is C4H9N and its molar mass is 71.12 g/mol.

What is Pyrrolidine used for?

Intermediate for pharmaceuticals, fungicides, insecticides, rubber accelerators, citrus decay control, curing agent for epoxy resins, inhibitor. Useful in tobacco flavors. Used in vulcanization accelerators. Reported uses (ppm): (FEMA, 1994) [Table#361]. Industrial uses: Intermediate.

Is Pyrrolidine hazardous?

Pyrrolidine carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, harmful if swallowed, causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrrolidine?

Pyrrolidine is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrrolidine?

CompoundList lists 101 suppliers of Pyrrolidine in China, United States, India, United Kingdom and 12 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyrrolidine in India?

9 suppliers in India list Pyrrolidine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Pyrrolidine?

Suppliers quote Pyrrolidine 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 Pyrrolidine

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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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