ChemicalBook > Product Catalog >Organic Chemistry >Hydrocarbons and derivatives >Cyclic hydrocarbons >Cyclopentene


Cyclopentene Suppliers list
Company Name: Kingfirst chemical (nanjing) co.,ltd
Tel: 86-25-84522992
Products Intro: Product Name:Cyclopentene
Purity:99%min Package:1KG;5KG;160KG;
Company Name: Henan Tianfu Chemical Co.,Ltd.
Tel: 0371-55170693
Products Intro: Product Name:142-29-0
Purity:0.99 Package:25KG,5KG;1KG;500G
Company Name: Shanghai Time Chemicals CO., Ltd.
Tel: +86-021-57951555 +8618017249410
Products Intro: CAS:142-29-0
Company Name: Hangzhou FandaChem Co.,Ltd.
Tel: 008615858145714
Products Intro: Product Name:Cyclopentene fandachem
Purity:As coa Package:As request Remarks:142-29-0
Company Name: Zhejiang ZETian Fine Chemicals Co. LTD
Tel: 18957127338
Products Intro: Product Name:Cyclopentene
Purity:0.99 Package:5KG;1KG Remarks:Have any requirements, pls contact

Cyclopentene manufacturers

  • Cyclopentene
  • $5.00 / Kg/Drum
  • 2021-12-01
  • CAS:142-29-0
  • Min. Order: 10g
  • Purity: 99 %
  • Supply Ability: 10000kg
  • Cyclopentene
  • $48.00-40.00 / KG
  • 2021-10-19
  • CAS:142-29-0
  • Min. Order: 1KG
  • Purity: 99%
  • Supply Ability: 200tons
  • Cyclopentene
  • $7.00 / KG
  • 2020-01-10
  • CAS:142-29-0
  • Min. Order: 1KG
  • Purity: 99%
  • Supply Ability: 100KG
Cyclopentene Basic information
Product Name:Cyclopentene
Synonyms:1-Cyclopentene;Cyclopenten;CYCLOPENTENE, STAB.;Cyclopentene, tech., ca 90%;Cyclopentene, 98+%;Cyclopentene, ca 90%, tech;Cyclopentene, tech.;Cyclopentene
Product Categories:Alkenes;Cyclic;Pharmaceutical Intermediates;Organic Building Blocks
Mol File:142-29-0.mol
Cyclopentene Structure
Cyclopentene Chemical Properties
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.)
Fp <−30 °F
storage temp. 0-6°C
solubility water: soluble0.535g/L at 25°C
form Liquid
color Colorless
Specific Gravity0.771
Water Solubility immiscible
Sensitive Air Sensitive
BRN 635707
Henry's Law Constant6.3 x 10-2 atm?m3/mol at 25 °C (Hine and Mookerjee, 1975)
Stability:Stable. Highly flammable. Incompatible with strong oxidizing agents. Store cold.
CAS DataBase Reference142-29-0(CAS DataBase Reference)
NIST Chemistry ReferenceCyclopentene(142-29-0)
EPA Substance Registry SystemCyclopentene (142-29-0)
Safety Information
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 Temperature743 °F
HazardClass 3
PackingGroup II
HS Code 29021990
ToxicityAcute oral LD50 for rats is 1,656 mg/kg (quoted, RTECS, 1985).
MSDS Information
Cyclopentene English
ACROS English
SigmaAldrich English
ALFA English
Cyclopentene Usage And Synthesis
Chemical PropertiesCyclopentene is a highly flammable liquid with a low flash point. It reacts readily with oxidizing agents.
Physical propertiesClear, colorless, watery, very flammable liquid with a characteristic sweet, petroleum-like odor.
UsesCyclopentene 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.
UsesCyclopentene 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.
UsesCross-linking agent; organic synthesis; solvent; extracting agent.
Production MethodsCyclopentene 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.
DefinitionChEBI: A cycloalkene that is cyclopentane having one endocyclic double bond.
General DescriptionA 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 ReactionsHighly flammable. Insoluble in water.
Reactivity ProfileCyclopentene 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 HazardMay be harmful by inhalation, ingestion, or skin absorption. May cause eye and skin irritation.
Fire HazardSpecial Hazards of Combustion Products: Vapor may travel considerable distance to a source of ignition and flashback. Explosion may occur under fire condition.
Safety ProfileModerately 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.
SourceSchauer 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 fateBiological. 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 MethodsFree 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 evaluationAcute 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.
Tag:Cyclopentene(142-29-0) Related Product Information
Cyclopentyl chloride Chloroiodomethane 3-Chloro-1-propanol Cyclopentanone 1,3-Cyclopentadiene 16-methyl-20-oxopregna-5,16-dien-3-beta-yl acetate Abacavir Prulifloxacin 16-Dehydroprogesterone 5ALPHA-ANDROST-16-EN-3-ONE 1-Methylcyclopentene 2-CYCLOPENTEN-1-YL ETHER, 98 (1S,5R)-(-)-2-OXABICYCLO[3.3.0]OCT-6-EN-3-ONE Jasmone BICYCLO[4.3.0]NONA-3,6(1)-DIENE 1,2-Dibromocyclopentene 5-Norbornene-2,3-dicarboxylic acid TIMTEC-BB SBB008460