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Cyclopentene structure
Chemical Name:
opentene;Cyclopenten;Cyclopcnten;Cyclopentene;1-Cyclopentene;Cyclopentene >Cyclopentene, 98+%;Cyclopentene, tech.;CYCLOPENTENE, STAB.;Cyclopentene fandachem
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
Specific Gravity
Water Solubility 
Air Sensitive
Henry's Law Constant
6.3 x 10-2 atm?m3/mol at 25 °C (Hine and Mookerjee, 1975)
Stable. Highly flammable. Incompatible with strong oxidizing agents. Store cold.
CAS DataBase Reference
142-29-0(CAS DataBase Reference)
EWG's Food Scores
NIST Chemistry Reference
EPA Substance Registry System
Cyclopentene (142-29-0)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H319-H225-H302+H312-H304-H315-H302-H312-H402-H412
Precautionary statements  P210-P280-P301+P310-P331-P233-P240-P241+P242+P243-P264-P270-P301+P312+P330-P302+P352+P312+P362+P364-P305+P351+P338+P337+P313-P370+P378-P403+P235-P501-P273-P280h-P301+P330+P331-P315-P403
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
Toxicity Acute oral LD50 for rats is 1,656 mg/kg (quoted, RTECS, 1985).
NFPA 704
1 1

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 $47.5 2021-03-22 Buy
Sigma-Aldrich 344508 Cyclopentene 96% 142-29-0 500ml $175 2021-03-22 Buy
TCI Chemical C0511 Cyclopentene >98.0%(GC) 142-29-0 25mL $21 2021-03-22 Buy
TCI Chemical C0511 Cyclopentene >98.0%(GC) 142-29-0 100mL $54 2021-03-22 Buy
Alfa Aesar 041461 Cyclopentene, 98+% 142-29-0 100ml $104 2021-03-22 Buy

Cyclopentene Chemical Properties,Uses,Production

Chemical Properties

Cyclopentene is a highly flammable liquid with a low flash point. It reacts readily with oxidizing agents.

Physical properties

Clear, colorless, watery, very flammable liquid with a characteristic sweet, petroleum-like odor.


Cyclopentene is a cycloalkene that is cyclopentane having one endocyclic double bond. Vapors heavier than air. Inhalation of high concentrations may be narcotic. Used to make rubber and plastics. Neopentyl phosphine ligand catalyzed Heck coupling of cyclopentene has been reported. Mechanism of reaction of ground state oxygen atom with cyclopentene has been investigated. Homopolymerization of cyclopentene has been reported. Photocatalytic oxidation of cyclopentene over various titanium(IV) oxide catalyst has been reported. Cyclopentene was used to investigate the [2+2] cycloaddition of diamond (001) surfaces with alkene.


Cross-linking agent; organic synthesis; solvent; extracting agent.

Production Methods

Cyclopentene is present in coal tar, cigarette smoke, and automobile emissions. It is also detected in air close to forests and as a decomposition product of polypropylene. It is used as a raw material in chemical synthesis.


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.


Schauer et al. (2001) measured organic compound emission rates for volatile organic compounds, gas-phase semi-volatile organic compounds, and particle-phase organic compounds from the residential (fireplace) combustion of pine, oak, and eucalyptus. The gas-phase emission rate of cyclopentene was 7.8 mg/kg of pine burned. Emission rates of cyclopentene were not measured during the combustion of oak and eucalyptus.
California Phase II reformulated gasoline contained cyclopentene at a concentration of 1,120 mg/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 480 and 31,700 μg/km, respectively (Schauer et al., 2002).
Given that cyclopentene is prepared from cyclohepentanol, the latter may be present as an impurity.

Environmental Fate

Biological. Cyclopentene may be oxidized by microbes to cyclopentanol, which may oxidize to cyclopentanone (Dugan, 1972).
Photolytic. The following rate constants were reported for the reaction of cyclopentene with OH radicals in the atmosphere: 6.39 x 10-11 cm3/molecule?sec (Atkinson et al., 1983), 4.99 x 10-11 cm3/molecule?sec at 298 K (Rogers, 1989), 4.0 x 10-10 cm3/molecule?sec (Atkinson, 1990) and 6.70 x 10-11 cm3/molecule?sec (Sablji? and Güsten, 1990); with ozone in the atmosphere: 8.13 x 10-16 at 298 K (Japar et al., 1974) and 9.69 x 10-16 cm3/molecule?sec at 294 K (Adeniji et al., 1981); with NO3 in the atmosphere: 4.6 x 10-13 cm3/molecule?sec at 298 K (Atkinson, 1990) and 5.81 x 10-13 cm3/molecule?sec at 298 K (Sablji? and Güsten, 1990).
Chemical/Physical. Gaseous products formed from the reaction of cyclopentene with ozone were (% yield): formic acid, carbon monoxide, carbon dioxide, ethylene , formaldehyde, and butanal. Particulate products identified include succinic acid, glutaraldehyde, 5-oxopentanoic acid, and glutaric acid (Hatakeyama et al., 1987).
At elevated temperatures, rupture of the C-C bond occurs forming molecular hydrogen and cyclopentadiene (95% yield) as the principal products (Rice and Murphy, 1942).

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.]

Toxicity evaluation

Acute Toxicity. The oral LD50 in the rat is 1656 mL/kg, and the dermal LD50 in the rabbit is 1231 mL/kg. Inhalation of the concentrated vapor was lethal to rats in 5min, and a 4 h exposure to 16,000 ppm was lethal to four of six rats.
Chronic and Subchronic Toxicity. Chronic exposure of rats to 112–1139 ppm for 12 weeks showed no effects, whereas 8110 ppm for 6 h/day, 5 days/week for 3 weeks resulted in decreased body weight gains of female rats.
Human Experience
General Information. Short-term exposure of cyclopentene to humans revealed a tolerable level of only 10–15 ppm.

Cyclopentene Preparation Products And Raw materials

Raw materials

Preparation Products

Cyclopentene Suppliers

Global( 214)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Kingfirst chemical (nanjing) co.,ltd
86-25-84774616 or 1617 CHINA 95 58
Henan DaKen Chemical CO.,LTD.
+86-371-66670886 China 21022 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22607 55
Hangzhou FandaChem Co.,Ltd.
+86-571-56059825 CHINA 8882 55
Zhejiang ZETian Fine Chemicals Co. LTD
18957127338 CHINA 2007 58
Hebei Guanlang Biotechnology Co., Ltd.
+8619930503282 China 5478 58
Wuhan Chemwonders Technology Inc.
027-85778276 CHINA 176 58
Xiamen AmoyChem Co., Ltd
+86 592-605 1114 CHINA 6369 58
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23035 58
86-18523575427 CHINA 47496 58

View Lastest Price from Cyclopentene manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-10-19 Cyclopentene
US $48.00-40.00 / KG 1KG 99% 200tons Guangzhou Sunton Biotechnology Co., Ltd.
2021-08-26 Cyclopentene
US $5.00 / Kg/Drum 10g 99 % 10000kg Hebei Crovell Biotech Co Ltd
2020-01-10 Cyclopentene
US $7.00 / KG 1KG 99% 100KG Career Henan Chemical Co

Cyclopentene Spectrum

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