ChemicalBook > CAS DataBase List > 1,3-Cyclopentadiene

1,3-Cyclopentadiene

Product Name
1,3-Cyclopentadiene
CAS No.
542-92-7
Chemical Name
1,3-Cyclopentadiene
Synonyms
Cyclopentadiene;pyropentylene;pentole;r-pentine;JACS-542-92-7;2,4-Cyclopentadiene;1，3-Cyclopentadiene;542-92-7 Cyclopentadiene;1,3-Cyclopentadiene 542-92-7 Cyclopentadiene
CBNumber
CB9852039
Molecular Formula
C5H6
Formula Weight
66.1
MOL File
542-92-7.mol
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1,3-Cyclopentadiene Property

Melting point:
-85°; mp 32.5°
Boiling point:
bp760 41.5-42.0°
Density 
d40 0.8235; d410 0.8131; d420 0.8021; d425 0.7966; d430 0.7914
vapor pressure 
381 at 20.6 °C, 735 at 40.6 °C, 1,380 at 60.9 °C (Stoeck and Roscher, 1977)
refractive index 
nD16 1.44632
solubility 
Miscible with acetone, benzene, carbon tetrachloride, and ether. Soluble in acetic acid, aniline, and carbon disulfide (Windholz et al., 1983).
form 
Colorless liquid
pka
16(at 25℃)
Water Solubility 
10.3 mM at 25 °C (shake flask-UV spectrophotometry, Streitwieser and Nebenzahl, 1976)
Henry's Law Constant
5.1 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits
TLV-TWA 75 ppm (～202 mg/m3) (ACGIH, NIOSH, and OSHA); IDLH 2000 ppm (NIOSH).
Stability:
Stable at room temperature. Incompatible with oxidizing agents, acids and a wide variety of other compounds. May form peroxides in storage. May undergo spontaneous polymerisation. Decomposes on heating. Highly flammable. Mixtures with air are explosive.
EPA Substance Registry System
Cyclopentadiene (542-92-7)
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Safety

RIDADR 
1993
OEB
A
OEL
TWA: 75 ppm (200 mg/m3)
HazardClass 
3.2
PackingGroup 
III
Hazardous Substances Data
542-92-7(Hazardous Substances Data)
Toxicity
LD50 of dimer orally in rats: 0.82 g/kg (Smyth)
IDLA
750 ppm
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H226Flammable liquid and vapour

H301Toxic if swalloed

H312Harmful in contact with skin

H315Causes skin irritation

H319Causes serious eye irritation

H332Harmful if inhaled

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

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/face protection.

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

P302+P352IF ON SKIN: wash with plenty of soap and water.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P312Call a POISON CENTER or doctor/physician if you feel unwell.

P321Specific treatment (see … on this label).

P322Specific measures (see …on this label).

P330Rinse mouth.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P362Take off contaminated clothing and wash before reuse.

P363Wash contaminated clothing before reuse.

P405Store locked up.

P501Dispose of contents/container to..…

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N-Bromosuccinimide Price

American Custom Chemicals Corporation
Product number
CHM0029167
Product name
1,3-CYCLOPENTADIENE
Purity
95.00%
Packaging
5G
Price
$4966.5
Updated
2021/12/16
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1,3-Cyclopentadiene Chemical Properties,Usage,Production

Description

Cyclopentadiene is a flammable, colorless liquid with a sweet odor, like turpentine. Molecularweight=66.10; Specific gravity (H2O:1): 0.8; Boilingpoint=42.℃; Freezing/Melting point=285℃; Vaporpressure=400 mmHg at 20℃; Flash point=25℃ (oc);Autoignition temperature=640℃. Insoluble in water.

Chemical Properties

1,3-Cyclopentadiene is a colorless liquid that dimerizes easily in the presence of peroxides and trichloroacetic acid to a colorless solid.

Chemical Properties

colourless liquid

Chemical Properties

Cyclopentadiene is a flammable, colorless liq- uid with a sweet odor, like turpentine.

Physical properties

Colorless liquid with a turpentine-like odor. Odor threshold concentration is 1.9 ppm (quoted, Amoore and Hautala, 1983).

Uses

Cyclopentadiene is used in the manufactureof resins, in the synthesis of sesquiterpenesand camphors, and as a ligand in the preparationof metal complexes.

Uses

In manufacture of resins; in organic synthesis

Uses

manufacture of resins; in organic synthesis as the diene in the Diels-Alder reaction producing sesquiterpenes, synthetic alkaloids, camphors.

Definition

A cyclic hydrocarbon made by cracking petroleum. The molecules have a five-membered ring containing two carbon- carbon double bonds and one CH2 group. It forms the negative cyclopentadienyl ionC5H5-, present in sandwich compounds, such as ferrocene.

Definition

cyclopentadiene: A colourless liquidcyclic alkene,C5H6; r.d. 0.8021;m.p. –97.2°C; b.p. 40.0°C. It is preparedas a by-product during the fractionaldistillation of crude benzenefrom coal tar. It undergoes condensationreactions with ketones to givehighly coloured compounds (fulvenes)and readily undergoes polymerizationat room temperature togive the dimer, dicyclopentadiene.Cyclopentadiene itself is not an aromaticcompound because it does nothave the required number of pi electrons.However, removal of a hydrogenatom produces the stablecyclopentadienyl ion,C5H5-, whichdoes have aromatic properties. Inparticular, the ring can coordinate topositive ions in such compounds asferrocene.

Production Methods

This compound occurs in the C6–C8 petroleum distillation fraction, and in coke oven light oil fractions. It is produced by dehydrogenation of cyclopentadiene or monomerization of its dimer.

General Description

1，3-Cyclopentadiene is a colorless liquid with an irritating, terpene-like odor. Bp: 42.5°C; Flash point: 77°F. Density: 0.805 g cm-3.

Reactivity Profile

1，3-Cyclopentadiene is incompatible with strong oxidizing agents. Ignites on contact with oxygen (O2) and ozone (O3). Explodes on contact with fuming nitric acid or a mixture of sulfuric acid and nitrogen tetroxide. Reacts vigorously on contact with potassium hydroxide and other strong bases. Mixtures with air are explosive. Presents a moderate explosion hazard when exposed to heat or flame. Decomposes violently at high temperature and pressure. May form explosive peroxides in storage. Undergoes a spontaneous dimerization at room temperature to give DI1，3-Cyclopentadiene (C10H12, CAS No: 77-73-6), which is a low-melting solid (melting point: 32.5°C). The reaction is strongly exothermic (Hazardous Chemicals Desk Reference, p. 360 (1987)), but occurs sufficiently slowly that 1，3-Cyclopentadiene can be said to be stable at room temperature. The dimerization accounts for the partial or complete solidification of liquid 1，3-Cyclopentadiene in storage. Polymerization occurs more rapidly and extensively at higher temperatures. When heated to 180-200°C, 1，3-Cyclopentadiene gives poly1，3-Cyclopentadiene, a white waxy solid. Stronger heating breaks down poly1，3-Cyclopentadiene and re-generates the monomeric 1，3-Cyclopentadiene as a vapor. The vapor decomposes violently at higher temperatures and pressures.

Health Hazard

Cyclopentadiene exhibited low toxicity inanimals. Inhalation produced irritation of theeyes and nose. A 3-mL amount injected subcutaneouslyinto rabbits resulted in narcosis,convulsions, and death (von Oettingen 1940).A dose of≤ 1 mL was nontoxic. Repeatedexposure to 500 ppm caused liver and kidneyinjuries in rats; but longer repeated exposuresto 250 ppm produced no such effects in testanimals (ACGIH 1986). An oral LD50 valuein rats for the dimeric form has been recordedas 820 mg/kg (Smyth 1954).

Fire Hazard

Flammable liquid; flash point (open cup) 32°C (90°F); fire- extinguishing agent: dry chemical, foam, or CO2; a water spray may be used to cool the surroundings. Prolonged exposure to air may cause peroxide formation.

Safety Profile

Low toxicity by ingestion. A dangerous fire hazard when exposed to heat or flame; can react with oxidizing materials. Moderate explosion hazard in the form of gas when exposed to heat or by chemical reaction. It decomposes violently at hgh temperatures and pressures. dimerization is highly exothermic. Explosive reaction with fuming nitric acid,dinitrogen tetroxide, sulfuric acid. Reaction with nitrogen oxide + oxygen forms an explosive product. Reaction with oxygen forms a flame-sensitive explosive product. Ignites on contact with oxygen + ozone. Reacts vigorously on contact with potassium hydroxide. Incompatible with oxides of nitrogen, sulfuric acid. When heated to decomposition it emits acrid smoke and fumes.

Potential Exposure

Cyclopentadiene is used as an inter- mediate in the manufacture of resins, insecticides, fungi- cides, and other chemicals.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Do NOT induce vomiting.

Environmental Fate

Biological. Cyclopentadiene may be oxidized by microbes to cyclopentanone (Dugan, 1972).
Chemical/Physical. Dimerizes to dicyclopentadiene on standing (Windholz et al., 1983).

storage

Color Code—Red: Flammability Hazard: Store ina flammable liquid storage area or approved cabinet awayfrom ignition sources and corrosive and reactive materials.May form peroxides in storage. Prior to working withcyclopentadiene you should be trained on its proper handling and storage. Cyclopentadiene must be stored to avoidcontact with strong oxidizing agents because violent reactions occur. Cyclopentadiene must be stored at temperaturesbelow 0℃ or it may undergo an explosive chemical reaction. Sources of ignition, such as smoking and open flames,are prohibited where cyclopentadiene is used, handled, orstored in a manner that could create a potential fire orexplosion hazard. Metal containers involving the transfer ofthis chemical should be grounded and bonded. Where possible, automatically pump liquid from drums or other storagecontainers to process containers. Drums must be equippedwith self-closing valves, pressure vacuum bungs, and flamearresters. Use only nonsparking tools and equipment, especially when opening and closing containers of this chemical. Sources of ignition, such as smoking and open flames,are prohibited where this chemical is used, handled, orstored in a manner that could create a potential fire orexplosion hazard. Wherever this chemical is used, handled,manufactured, or stored, use explosion-proof electricalequipment and fittings.

Shipping

UN1993 Flammable liquids, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid, Technical Name Required.

Purification Methods

Dry the diene with Mg(ClO4)2 and distil it rapidly as it dimerises readily at room temperature. It should be used immediately or stored in a Dry Ice or an ice-salt bath. HIGHLY FLAMMABLE. [Moffett Org Synth Coll Vol IV 238 1963.] Cyclopentadiene Dimer (4,7-methano-3a,4,7,7a-tetrahydroindene) has [77-73-6], M 132.3, m 33o, b 170o/atm, and d2 5 0.986; add ~0.05% of 2,6-di-tert-butyl-4-methylphenol as stabilizer. Cyclopentadiene is prepared when required by de-polymerising the technical grade dimer by heating it carefully under a fractionating column [Wilkinson Org Synth Coll Vol IV 467 1963], as described by Moffett (above reference), or by adding the dimer at a steady rate onto mineral oil heated at 240-270o (Korach et al. Org Synth 42 50 1962). [Beilstein 5 II 391.]

Incompatibilities

Vapors may form explosive mixture with air. Converted (dimerized) to higher-boiling dicyclopenta- diene upon standing in air and @ 32 F/0 C; this conversion may be violent and exothermic; this reaction is accelerated by peroxides or trichloroacetic acid. Reacts violently with potassium hydroxide. Violent reaction with strong oxidi- zers; strong acids; dinitrogen tetroxide; magnesium. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoa- cids, epoxides, alkaline earth metals, nitrogen oxides. May accumulate static electrical charges, and may cause ignition of its vapors.

Waste Disposal

Dissolve or mix the material with a combustible solvent and burn in a chemical incinera- tor equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.

1,3-Cyclopentadiene Preparation Products And Raw materials

Raw materials

Motor benzol Dicyclopentadiene light benzol Packed tower COAL TAR TRANS-1,3-PENTADIENE 1,4-PENTADIENE Cyclopentene Cyclopentane

Preparation Products

metallocene catalyst ((1R,4S)-2-Azabicyclo[2.2.1]hept-5-en-3-one titanium(zirconium)dialkyl endo-silicon cyclopentadiethyl tert-butylamine 5-ETHYLIDENE-2-NORBORNENE Ferrocene CHLORDANE METHYL A YCLOPENTYLMANDELATE 1-Methyl-3-(a-cyclopentylmandeloyloxy)pyrrolidinehydrochloride Carbic anhydride HEPTENOPHOS Olaquindox 2-Chloro-5-(chloromethyl)pyridine Hexachlorocyclopentadiene Thidiazuron Dicyclopentadiene Methidathion 1-methylcyclopenta-1,3-diene Thiosulfan 1,5-Pentanediol Basic Yellow 24 Bis(cyclopentadienyl)zirconium chloride hydride Cyclopentene Cyclopentane Bipariden Malotilate Catonic Dark Yellow 2RL 2-Azabicyclo[2.2.1]hept-5-en-3-one 1，2，3，4-tetrachlorocyclopentane
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China 91 China Hong Kong 1 France 2 Germany 1 India 4 Japan 1 Norway 1 South Korea 1 United States 10 Global 112
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View Lastest Price from 1,3-Cyclopentadiene manufacturers

Hebei Yanxi Chemical Co., Ltd.
Product
1,3-Cyclopentadiene 542-92-7
Price
US $40.00-26.00/kg
Min. Order
1kg
Purity
0.99
Supply Ability
10 tons
Release date
2023-09-07
Hebei Chuanghai Biotechnology Co,.LTD
Product
1,3-Cyclopentadiene 542-92-7
Price
US $100.00-50.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
10000kg
Release date
2024-08-21
Hebei Mojin Biotechnology Co., Ltd
Product
1,3-Cyclopentadiene 542-92-7
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
50000KG/month
Release date
2023-11-30

542-92-7, 1,3-CyclopentadieneRelated Search:

Cyclohexene Cyclopentene LITHIUM CYCLOPENTADIENIDE 5-(DIMETHYLAMINOMETHYLENE)-1,3-CYCLOPENTADIENE 1,2,3,4-Tetrachloro-5,5-dimethoxycyclopentadiene SPIRO[2.4]HEPTA-4,6-DIENE CYCLOPENTADIENYLTRIMETHYLSILANE SODIUM CYCLOPENTADIENIDE 5-BROMO-1,2,3,4,5-PENTAPHENYL-1,3-CYCLOPENTADIENE Guaiazulene 1,2,3,4-TETRAPHENYL-1,3-CYCLOPENTADIENE 98%,1,2,3,4-TETRAPHENYL-1,3-CYCLOPENTADIENE 98% Tetraphenylcyclopentadienone 1,2,3,4,5-PENTAPHENYL-1,3-CYCLOPENTADIENE 1,2,3,4,5-pentamethyl-1,3-cyclopentadiene,1,2,3,4,5-pentamethyl-1,3-cyclopentadiene Hexachlorocyclopentadiene DIPHENYLFULVENE 6,6-DIMETHYLFULVENE 1,1'-Bis(diphenylphosphino)ferrocene

  • Cyclopentadiene
  • pentole
  • pyropentylene
  • r-pentine
  • JACS-542-92-7
  • 1，3-Cyclopentadiene
  • 2,4-Cyclopentadiene
  • 1,3-Cyclopentadiene 542-92-7 Cyclopentadiene
  • 542-92-7 Cyclopentadiene
  • 542-92-7
  • C5H5
  • K00001