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Cyclopentene structure
Chemical Name:
Cyclopcnten;Cyclopenten;Cyclopentene;1-Cyclopentene;Cyclopentene, 98+%;CYCLOPENTENE, STAB.;Cyclopentene, tech.;Cyclopentene, tech., ≥95%;Cyclopentene, ca 90%, tech;Cyclopentene, tech., ca 90%
Molecular Formula:
Formula Weight:
MOL File:

Cyclopentene Properties

Melting point:
−135 °C(lit.)
Boiling point:
44-46 °C(lit.)
0.771 g/mL at 25 °C(lit.)
vapor pressure 
20.89 psi ( 55 °C)
refractive index 
n20/D 1.421(lit.)
Flash point:
<−30 °F
storage temp. 
water: soluble0.535g/L at 25°C
Water Solubility 
Air Sensitive
Stable. Highly flammable. Incompatible with strong oxidizing agents. Store cold.
CAS DataBase Reference
142-29-0(CAS DataBase Reference)
NIST Chemistry Reference
EPA Substance Registry System
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  F,Xn
Risk Statements  11-21/22-36/37/38-65-67-52/53-38
Safety Statements  9-16-26-33-36-62-61-36/37
RIDADR  UN 2246 3/PG 2
WGK Germany  3
RTECS  GY5950000
Autoignition Temperature 743 °F
HazardClass  3
PackingGroup  II
HS Code  29021990
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger
H312 Harmful in contact with skin Acute toxicity,dermal Category 4 Warning P280,P302+P352, P312, P322, P363,P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H402 Harmful to aquatic life Hazardous to the aquatic environment, acute hazard Category 3
H412 Harmful to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 3 P273, P501
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233 Keep container tightly closed.
P240 Ground/bond container and receiving equipment.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P273 Avoid release to the environment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P315 Get immediate medical advice/attention.
P331 Do NOT induce vomiting.
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P370+P378 In case of fire: Use … for extinction.
P403 Store in a well-ventilated place.
P403+P235 Store in a well-ventilated place. Keep cool.
P501 Dispose of contents/container to..…

NFPA 704

Diamond Hazard Value Description
1 1
Health   1 Exposure would cause irritation with only minor residual injury (e.g. acetone, sodium bromate, potassium chloride)
Flammability   3 Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions . Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). (e.g. gasoline, acetone)
Instability   1 Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene)

(NFPA, 2010)

Cyclopentene price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 344508 Cyclopentene 96% 142-29-0 100ml $44.3 2018-11-20 Buy
Sigma-Aldrich 344508 Cyclopentene 96% 142-29-0 500ml $162 2018-11-20 Buy
TCI Chemical C0511 Cyclopentene >98.0%(GC) 142-29-0 25mL $18 2018-11-22 Buy
TCI Chemical C0511 Cyclopentene >98.0%(GC) 142-29-0 100mL $47 2018-11-22 Buy
Alfa Aesar 041461 Cyclopentene, 98+% 142-29-0 25ml $31.3 2018-11-16 Buy

Cyclopentene Chemical Properties,Uses,Production

Chemical Properties

colourless liquid with a petrol-like odour


ChEBI: A cycloalkene that is cyclopentane having one endocyclic double bond.

General Description

A colorless liquid. Less dense than water and insoluble in water. Flash point below 0°F. Vapors heavier than air. Inhalation of high concentrations may be narcotic. Used to make rubber and plastics.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

Cyclopentene may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.

Health Hazard

May be harmful by inhalation, ingestion, or skin absorption. May cause eye and skin irritation.

Fire Hazard

Special Hazards of Combustion Products: Vapor may travel considerable distance to a source of ignition and flashback. Explosion may occur under fire condition.

Safety Profile

Moderately toxic by ingestion and skin contact. A very dangerous fire hazard when exposed to flame or heat; can react with oxidning materials. Keep away from heat and open flame. To fight fire, use foam, CO2, dry chemical.

Purification Methods

Free cyclopentene from hydroperoxide by refluxing with cupric stearate. Fractionally distil it from Na. It can be chromatographed on a Dowex 710-Chromosorb W GLC column. Methods for cyclohexene should be applicable here. Also, it has been washed with 1M NaOH solution followed by water. It was dried over anhydrous Na2SO4, distilled over powdered NaOH under nitrogen, and passed through neutral alumina before use [Woon et al. J Am Chem Soc 108 7990 1986]. It was distilled in a dry nitrogen atmosphere from powdered fused NaOH through a Vigreux column (p 11), and then passed through activated neutral alumina before use [Wong et al. J Am Chem Soc 109 3428 1987]. [Beilstein 5 IV 209.]

Cyclopentene Preparation Products And Raw materials

Raw materials

Preparation Products

Cyclopentene Suppliers

Global( 188)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Kingfirst chemical (nanjing) co.,ltd
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Cyclopentene Spectrum

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