ChemicalBook > CAS DataBase List > Cyclopentene

Cyclopentene

Product Name
Cyclopentene
CAS No.
142-29-0
Chemical Name
Cyclopentene
Synonyms
Cyclopenten;opentene;Cyclopcnten;Cyclopentene;1-Cyclopentene;Cyclopentene >Cyclopentene, 98+%;Cyclopentene, tech.;CYCLOPENTENE, STAB.;Cyclopentene, tech., ≥95%
CBNumber
CB7231452
Molecular Formula
C5H8
Formula Weight
68.12
MOL File
142-29-0.mol
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Cyclopentene Property

Melting point:
−135 °C(lit.)
Boiling point:
44-46 °C(lit.)
Density 
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. 
0-6°C
solubility 
water: soluble0.535g/L at 25°C
form 
Liquid
color 
Colorless
Specific Gravity
0.771
Water Solubility 
immiscible
Sensitive 
Air Sensitive
BRN 
635707
Henry's Law Constant
6.3 x 10-2 atm?m3/mol at 25 °C (Hine and Mookerjee, 1975)
Stability:
Stable. Highly flammable. Incompatible with strong oxidizing agents. Store cold.
InChIKey
LPIQUOYDBNQMRZ-UHFFFAOYSA-N
LogP
2.47 at 25℃
CAS DataBase Reference
142-29-0(CAS DataBase Reference)
NIST Chemistry Reference
Cyclopentene(142-29-0)
EPA Substance Registry System
Cyclopentene (142-29-0)
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Safety

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
F 
10-23
Autoignition Temperature
743 °F
TSCA 
Yes
HazardClass 
3
PackingGroup 
II
HS Code 
29021990
Toxicity
Acute oral LD50 for rats is 1,656 mg/kg (quoted, RTECS, 1985).
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H225Highly Flammable liquid and vapour

H304May be fatal if swallowed and enters airways

H315Causes skin irritation

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P331Do NOT induce vomiting.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
344508
Product name
Cyclopentene
Purity
96%
Packaging
100ml
Price
$55.6
Updated
2024/03/01
Sigma-Aldrich
Product number
344508
Product name
Cyclopentene
Purity
96%
Packaging
500ml
Price
$204
Updated
2024/03/01
TCI Chemical
Product number
C0511
Product name
Cyclopentene
Purity
>98.0%(GC)
Packaging
25mL
Price
$23
Updated
2024/03/01
TCI Chemical
Product number
C0511
Product name
Cyclopentene
Purity
>98.0%(GC)
Packaging
100mL
Price
$58
Updated
2024/03/01
Alfa Aesar
Product number
041461
Product name
Cyclopentene, 98+%
Packaging
25ml
Price
$35.65
Updated
2024/03/01
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Cyclopentene Chemical Properties,Usage,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.

Uses

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.

Uses

Cyclopentene is used in organic synthesis for cross-linking resin. It is used as an intermediate in Industries such as Agrochemical, Dyestuff, Pharmaceutical, syntheses material, Chemical. It is used as a monomer for synthesis of plastics and rubber. It is also used for the synthesis of various chemicals, such as 1,1,2-Trimethylcyclohexane.

Preparation

Cyclopentene is synthesized by selective hydrogenation of cyclopentadiene or by dehydration of cyclopentanol. It is produced industrially in large amounts by steam cracking of naphtha. Cyclopentene is present in coal tar, cigarette smoke, and automobile emissions.

Definition

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

General Description

Cyclopentene appears as 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.

Source

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

Dicyclopentadiene Cyclopentanol Isoprene 1,3-Cyclopentadiene Aluminum oxide

Preparation Products

Ramipril Sebacic acid 2-Allyl-4-hydroxy-3-methyl-2-cyclopenten-1-one LENAMPICILLIN 2-Chlorophenyl cyclopentyl ketone Ketamine hydrochloride ROSAPROSTOL Prostaglandin E1 3-Ethyl-2-hydroxy-2-cyclopenten-1-one KETAMINE RELATED COMPOUND A (50 MG) (1 -[(2-CHLOROPHENYL)(METHYLIMINO)METHYL]CYLCOPENTA-NOL) Cyclopentene oxide 1,3-Cyclopentadiene
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View Lastest Price from Cyclopentene manufacturers

Hebei Chuanghai Biotechnology Co,.LTD
Product
Cyclopentene 142-29-0
Price
US $5.00/kg
Min. Order
10kg
Purity
99 %
Supply Ability
10000kg
Release date
2024-08-22
Hebei Weibang Biotechnology Co., Ltd
Product
Cyclopentene 142-29-0
Price
US $1.00/PCS
Min. Order
1KG
Purity
99%
Supply Ability
10 mt
Release date
2021-01-19
Henan Fengda Chemical Co., Ltd
Product
Cyclopentene 142-29-0
Price
US $100.00-1.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
g-kg-tons, free sample is available
Release date
2023-12-26

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