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Olefins and dienes

trans-2-Pentene

Also known as (E)-2-Pentene, (E)-pent-2-ene, 2-Pentene

CAS 646-04-8Formula C5H10Molar mass 70.14 g/molEC 203-695-0
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant, Serious health hazard 6 suppliers listed
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trans-2-Pentene chemical structure, C5H10, CAS 646-04-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Liquid
Melting point
-140.2 °C
Boiling point
36.3 °C
Density
0.6431 @ 25 °C/4 °C
Flash point
<-20
HS code
290129
Category
Olefins and dienes
UN number
UN 3295
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is trans-2-Pentene?

Plain description, key identifiers and synonyms

2-pentene, (e)- is a colorless liquid with a hydrocarbon odor. Usually in technical grade as a mixture of isomers. Used as a solvent, in organic synthesis, and as a polymerization inhibitor.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(E)-pent-2-ene
CAS number
646-04-8 CAS number cross-checkedOther or deprecated CAS: 109-68-2, 58718-78-8
EC numbers
203-695-0, 211-461-4, 261-403-7
Molecular formula
C5H10
UNII
Y5RK21VDPE, YCO1SJQ98H
MDL number
MFCD00009384
InChIKey
QMMOXUPEWRXHJS-HWKANZROSA-N
InChI
InChI=1S/C5H10/c1-3-5-4-2/h3,5H,4H2,1-2H3/b5-3+
Canonical SMILES
CC=CCC
Isomeric SMILES
CC/C=C/C

Synonyms

  • (E)-2-Pentene
  • (E)-pent-2-ene
  • 2-Pentene
  • 2-Pentene, (E)-
  • Methylbut-1-ene
  • 2-Pentene, (2E)-
  • (2E)-2-Pentene
  • 3-Pentene
  • sym-Methylethylethylene
  • trans-beta-Amylene
  • trans-beta-N-Amylene
  • beta-n-Amylene
  • 2-Pentene, cis + trans
  • trans-Pent-2-ene
  • trans-2-Amylene
  • (2E)-pent-2-ene
  • trans-2-Pentene, 99%
  • 2-trans-Pentene
  • E-2-pentene
  • D-Pro37-Tirzepatide
  • 2-Pentene, trans-
  • 4-01-00-00814 (Beilstein Handbook Reference)
  • 2-Pentene (E)-form

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
Liquidexp.
Melting point
-140.2 °Cexp.
Boiling point
36.3 °Cexp.
Density
0.6431 @ 25 °C/4 °Cexp.
Flash point
<-20exp.
Solubility
In water, 203 mg/l @ 25 °Cexp.
Vapour pressure
5.06 × 10⁺² mm Hg @ 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
70.14 g/molcalc.
Exact mass
70.0783 Dacalc.
LogP (octanol/water)
1.97calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.6calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
400NFPA 704 rating

Hazard statements

  • H224Extremely flammable liquid and vapour.
  • H225Highly flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H304May be fatal if swallowed and enters airways.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H332Harmful if inhaled.
  • H335May cause respiratory irritation.
Precautionary statements (31)
  • 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.
  • 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 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P331Do not induce vomiting.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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 3295

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

trans-2-Pentene suppliers

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

All 6 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

6 suppliers in 2 countries

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trans-2-Pentene 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

Polymerization inhibitor, organic synth (2-Pentene).

Chemical intermediate for petroleum resins (as mixed pentenes).

Chemical intermediate for sec-amyl alcohols (isomeric mixt).

Hydrocarbon solvent.

How it is made

Prepn of mixture of cis & trans isomers by dehydration of 2-pentanol ... Prepn of the ... trans form from 1-ethyl-2-iodobutyric acid with sodium carbonate ... prepn of both isomers from sec-amyl alc with H2SO4 and diatomaceous earth @ 90-110 °C for 3 hr

Cracking of petroleum distillates followed by separation

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 trans-2-Pentene is traded under.

HS 2901.29Indicative HS code

Unsaturated, other

World exports in 2024
$2.65B
−3.2% vs 2023, imports $2.57B
2019 to 2024
Top exporters
  1. United States43.9%
  2. South Africa15.3%
  3. Qatar * partner reported9.0%
Top importers
  1. Singapore10.9%
  2. United States10.1%
  3. South Korea8.7%

* Partner reported figures, a lower bound.

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

The HS code shown for trans-2-Pentene is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about trans-2-Pentene, based on the data on this page

What is trans-2-Pentene?

2-pentene, (e)- is a colorless liquid with a hydrocarbon odor. Usually in technical grade as a mixture of isomers. Used as a solvent, in organic synthesis, and as a polymerization inhibitor.

What is trans-2-Pentene used for?

Polymerization inhibitor, organic synth (2-Pentene). Chemical intermediate for petroleum resins (as mixed pentenes). Chemical intermediate for sec-amyl alcohols (isomeric mixt). Hydrocarbon solvent.

Is trans-2-Pentene hazardous?

trans-2-Pentene carries the GHS signal word "Danger". Main hazards: extremely flammable liquid and vapour, highly flammable liquid and vapour, harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

Guides for buyers

Practical guides that help when you source, ship or handle trans-2-Pentene

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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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