Cyclopentadiene
- Cyclopentadiene
- 1,3-CYCLOPENTADIENE
- cyclopenta-1,3-diene
- 542-92-7
- Pyropentylene
- Create:2004-09-16
- Modify:2025-01-18
- Cyclopentadiene
- Cyclopentadienes
- Cyclopentane
- Cyclopentanes
- Cyclopentene
- Cyclopentenes
- Cyclopentadiene
- 1,3-CYCLOPENTADIENE
- cyclopenta-1,3-diene
- 542-92-7
- Pyropentylene
- Pentole
- R-Pentine
- HSDB 2514
- EINECS 208-835-4
- UNII-5DFH9434HF
- 5DFH9434HF
- 26912-33-4
- DTXSID0027191
- CHEBI:30664
- DTXCID007191
- EC 208-835-4
- cyclopentadien
- cyclo pentadiene
- cyclo-pentadiene
- CYCLOPENTADIENE [MI]
- ghl.PD_Mitscher_leg0.1205
- CHEMBL3188826
- 1,3-CYCLOPENTADIENE [HSDB]
- Tox21_302134
- AKOS025295445
- AT31522
- NCGC00255341-01
- CAS-542-92-7
- DB-013019
- NS00006170
- 1.3-cyclopentadiene pound Dimer form pound(c)
- A818675
- Q424390
- Q2209035
- InChI=1/C5H6/c1-2-4-5-3-1/h1-4H,5H
Odor Threshold Low: 1.8 [mmHg]
Odor threshold from AIHA
- Coriolis coupling
- Schoenflies notation
- Boiling point
- Centrifugal distortion
- Chemical bond
- Composition
- Crystal structure
- Density
- Diamagnetic susceptibility
- Diamagnetic susceptibility exaltation
- Electric dipole moment
- Equilibrium structure
- Exaltation data
- Formula unit
- Fusion temperature
- Heat of sublimation
- Internuclear distance
- Magnetic anisotropy
- Magnetic permeability
- Magnetic susceptibility
- Magnetic susceptibility exaltation
- Melting temperature
- Molecular dipole moment
- Molecular structure
- Optical coefficient
- Phase diagram
- Phase transition
- Point group
- Refractive index
- Rotation-vibration spectrum
- Rotational excitation cross section
- Space group
- Thermal expansion coefficient
- Transition enthalpy
- Unit cell
- Unit cell parameter
- Vapor pressure
- Vibrational mode frequency
- Monomers
- Intermediate
- Intermediates
- Plasticizers
- Intermediates
- Plasticizers
- Monomers
2019: 1,000,000 - <10,000,000 lb
2018: 1,000,000 - <10,000,000 lb
2017: 1,000,000 - <10,000,000 lb
2016: 1,000,000 - <10,000,000 lb
- Petrochemical Manufacturing
- Plastics Material and Resin Manufacturing
- Petroleum Refineries
- All Other Basic Organic Chemical Manufacturing
H225 (24.8%): Highly Flammable liquid and vapor [Danger Flammable liquids]
H226 (75.2%): Flammable liquid and vapor [Warning Flammable liquids]
H301+H311 (24.5%): Toxic if swallowed or in contact with skin [Danger Acute toxicity, oral; acute toxicity, dermal]
H301 (91.8%): Toxic if swallowed [Danger Acute toxicity, oral]
H311 (26.2%): Toxic in contact with skin [Danger Acute toxicity, dermal]
H312 (65.6%): Harmful in contact with skin [Warning Acute toxicity, dermal]
H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]
H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H332 (87%): Harmful if inhaled [Warning Acute toxicity, inhalation]
H335 (100%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
P210, P233, P240, P241, P242, P243, P261, P262, P264, P264+P265, P270, P271, P280, P301+P316, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P316, P317, P319, P321, P330, P332+P317, P337+P317, P361+P364, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501
(The corresponding statement to each P-code can be found at the GHS Classification page.)
Aggregated GHS information provided per 355 reports by companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown.
Flam. Liq. 2 (24.8%)
Flam. Liq. 3 (75.2%)
Acute Tox. 3 (91.8%)
Acute Tox. 3 (26.2%)
Acute Tox. 4 (65.6%)
Skin Irrit. 2 (100%)
Eye Irrit. 2 (100%)
Acute Tox. 4 (87%)
STOT SE 3 (100%)
Flammable liquids - Category 2
Acute toxicity (Oral) - Category 3
Acute toxicity (Dermal) - Category 3
Acute toxicity (Inhalation: Vapours) - Category 4
Serious eye damage/eye irritation - Category 2A-2B
Specific target organ toxicity - Single exposure - Category 3 (Respiratory tract irritation)
Specific target organ toxicity - Repeated exposure - Category 2 (liver, kidney)
Excerpt from NIOSH Pocket Guide for Cyclopentadiene:
Exposure Routes: Inhalation, ingestion, skin and/or eye contact
Symptoms: Irritation eyes, nose
Target Organs: Eyes, respiratory system (NIOSH, 2024)
Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas (sewers, basements, tanks, etc.). Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids will float on water. Substance may be transported hot. For hybrid vehicles, ERG Guide 147 (lithium ion or sodium ion batteries) or ERG Guide 138 (sodium batteries) should also be consulted. If molten aluminum is involved, refer to ERG Guide 169. (ERG, 2024)
Excerpt from NIOSH Pocket Guide for Cyclopentadiene:
Eye: IRRIGATE IMMEDIATELY - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.
Skin: SOAP WASH PROMPTLY - If this chemical contacts the skin, promptly wash the contaminated skin with soap and water. If this chemical penetrates the clothing, promptly remove the clothing and wash the skin with soap and water. Get medical attention promptly.
Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.
Swallow: MEDICAL ATTENTION IMMEDIATELY - If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2024)
(See general first aid procedures)
Eye: Irrigate immediately - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.
Skin: Soap wash promptly - If this chemical contacts the skin, promptly wash the contaminated skin with soap and water. If this chemical penetrates the clothing, promptly remove the clothing and wash the skin with soap and water. Get medical attention promptly.
Breathing: Respiratory support
Swallow: Medical attention immediately - If this chemical has been swallowed, get medical attention immediately.
Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:
CAUTION: The majority of these products have a very low flash point. Use of water spray when fighting fire may be inefficient. CAUTION: For mixtures containing alcohol or polar solvent, alcohol-resistant foam may be more effective.
SMALL FIRE: Dry chemical, CO2, water spray or regular foam. If regular foam is ineffective or unavailable, use alcohol-resistant foam.
LARGE FIRE: Water spray, fog or regular foam. If regular foam is ineffective or unavailable, use alcohol-resistant foam. Avoid aiming straight or solid streams directly onto the product. If it can be done safely, move undamaged containers away from the area around the fire.
FIRE INVOLVING TANKS, RAIL TANK CARS OR HIGHWAY TANKS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. For petroleum crude oil, do not spray water directly into a breached tank car. This can lead to a dangerous boil over. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks in direct contact with flames. For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2024)
Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:
IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
LARGE SPILL: Consider initial downwind evacuation for at least 300 meters (1000 feet).
FIRE: If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2024)
Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:
ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. All equipment used when handling the product must be grounded. Do not touch or walk through spilled material. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. A vapor-suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean, non-sparking tools to collect absorbed material.
LARGE SPILL: Dike far ahead of liquid spill for later disposal. Water spray may reduce vapor, but may not prevent ignition in closed spaces. (ERG, 2024)
750.0 [ppm]
Excerpts from Documentation for IDLHs: Basis for original (SCP) IDLH: The chosen IDLH is based on the statement by Deichmann and Gerarde [1969] that 4 of 6 rats died from a 4hour exposure to 2,000 ppm [Smyth et al. 1954]. . . . Human data: None relevant for use in determining the revised IDLH.
750 ppm
See: 542927
Excerpt from NIOSH Pocket Guide for Cyclopentadiene:
Skin: PREVENT SKIN CONTACT - Wear appropriate personal protective clothing to prevent skin contact.
Eyes: PREVENT EYE CONTACT - Wear appropriate eye protection to prevent eye contact.
Wash skin: WHEN CONTAMINATED - The worker should immediately wash the skin when it becomes contaminated.
Remove: WHEN WET (FLAMMABLE) - Work clothing that becomes wet should be immediately removed due to its flammability hazard (i.e., for liquids with a flash point <100 °F).
Change: No recommendation is made specifying the need for the worker to change clothing after the workshift. (NIOSH, 2024)
(See personal protection and sanitation codes)
Skin: Prevent skin contact - Wear appropriate personal protective clothing to prevent skin contact.
Eyes: Prevent eye contact - Wear appropriate eye protection to prevent eye contact.
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation
NIOSH/OSHA
Up to 750 ppm:
(APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)
(APF = 10) Any supplied-air respirator
(APF = 50) Any self-contained breathing apparatus with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus
Hydrocarbons, Aliphatic Unsaturated
Conjugated Dienes
Highly Flammable
Explosive
Neurotoxin - Acute solvent syndrome
Occupational hepatotoxin - Secondary hepatotoxins: the potential for toxic effect in the occupational setting is based on cases of poisoning by human ingestion or animal experimentation.
Patents are available for this chemical structure:
https://patentscope.wipo.int/search/en/result.jsf?inchikey=ZSWFCLXCOIISFI-UHFFFAOYSA-N
- Australian Industrial Chemicals Introduction Scheme (AICIS)1,3-Cyclopentadienehttps://services.industrialchemicals.gov.au/search-inventory/
- CAMEO ChemicalsLICENSECAMEO Chemicals and all other CAMEO products are available at no charge to those organizations and individuals (recipients) responsible for the safe handling of chemicals. However, some of the chemical data itself is subject to the copyright restrictions of the companies or organizations that provided the data.https://cameochemicals.noaa.gov/help/reference/terms_and_conditions.htm?d_f=falseCYCLOPENTADIENEhttps://cameochemicals.noaa.gov/chemical/25015CAMEO Chemical Reactivity Classificationhttps://cameochemicals.noaa.gov/browse/react
- ILO-WHO International Chemical Safety Cards (ICSCs)
- CAS Common ChemistryLICENSEThe data from CAS Common Chemistry is provided under a CC-BY-NC 4.0 license, unless otherwise stated.https://creativecommons.org/licenses/by-nc/4.0/Cyclopentadienehttps://commonchemistry.cas.org/detail?cas_rn=542-92-71,3-Cyclopentadiene, tetramerhttps://commonchemistry.cas.org/detail?cas_rn=54405-19-51,3-Cyclopentadiene, trimerhttps://commonchemistry.cas.org/detail?cas_rn=26779-34-01,3-Cyclopentadiene, dimerhttps://commonchemistry.cas.org/detail?cas_rn=7313-32-8Cyclopentadiene homopolymerhttps://commonchemistry.cas.org/detail?cas_rn=25568-84-7
- ChemIDplus1,3-Cyclopentadienehttps://pubchem.ncbi.nlm.nih.gov/substance/?source=chemidplus&sourceid=0000542927ChemIDplus Chemical Information Classificationhttps://pubchem.ncbi.nlm.nih.gov/source/ChemIDplus
- EPA Chemical Data Reporting (CDR)LICENSEThe U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce these documents, or allow others to do so, for U.S. Government purposes. These documents may be freely distributed and used for non-commercial, scientific and educational purposes.https://www.epa.gov/web-policies-and-procedures/epa-disclaimers#copyright1,3-Cyclopentadienehttps://www.epa.gov/chemical-data-reporting
- EPA Chemicals under the TSCA1,3-Cyclopentadienehttps://www.epa.gov/chemicals-under-tscaEPA TSCA Classificationhttps://www.epa.gov/tsca-inventory
- EPA DSSTox1,3-Cyclopentadienehttps://comptox.epa.gov/dashboard/DTXSID0027191Cyclopentadienyl radicalhttps://comptox.epa.gov/dashboard/DTXSID00175702CompTox Chemicals Dashboard Chemical Listshttps://comptox.epa.gov/dashboard/chemical-lists/
- European Chemicals Agency (ECHA)LICENSEUse of the information, documents and data from the ECHA website is subject to the terms and conditions of this Legal Notice, and subject to other binding limitations provided for under applicable law, the information, documents and data made available on the ECHA website may be reproduced, distributed and/or used, totally or in part, for non-commercial purposes provided that ECHA is acknowledged as the source: "Source: European Chemicals Agency, http://echa.europa.eu/". Such acknowledgement must be included in each copy of the material. ECHA permits and encourages organisations and individuals to create links to the ECHA website under the following cumulative conditions: Links can only be made to webpages that provide a link to the Legal Notice page.https://echa.europa.eu/web/guest/legal-noticeCyclopentadienehttps://chem.echa.europa.eu/100.008.033Cyclopentadiene (EC: 208-835-4)https://echa.europa.eu/information-on-chemicals/cl-inventory-database/-/discli/details/45161
- FDA Global Substance Registration System (GSRS)LICENSEUnless otherwise noted, the contents of the FDA website (www.fda.gov), both text and graphics, are not copyrighted. They are in the public domain and may be republished, reprinted and otherwise used freely by anyone without the need to obtain permission from FDA. Credit to the U.S. Food and Drug Administration as the source is appreciated but not required.https://www.fda.gov/about-fda/about-website/website-policies#linking
- Hazardous Substances Data Bank (HSDB)1,3-CYCLOPENTADIENEhttps://pubchem.ncbi.nlm.nih.gov/source/hsdb/2514
- Human Metabolome Database (HMDB)LICENSEHMDB is offered to the public as a freely available resource. Use and re-distribution of the data, in whole or in part, for commercial purposes requires explicit permission of the authors and explicit acknowledgment of the source material (HMDB) and the original publication (see the HMDB citing page). We ask that users who download significant portions of the database cite the HMDB paper in any resulting publications.http://www.hmdb.ca/citingCyclopentadienehttp://www.hmdb.ca/metabolites/HMDB0061878
- New Zealand Environmental Protection Authority (EPA)LICENSEThis work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International licence.https://www.epa.govt.nz/about-this-site/general-copyright-statement/
- NJDOH RTK Hazardous Substance Listcyclopentadienehttp://nj.gov/health/eoh/rtkweb/documents/fs/0582.pdf
- Occupational Safety and Health Administration (OSHA)LICENSEMaterials created by the federal government are generally part of the public domain and may be used, reproduced and distributed without permission. Therefore, content on this website which is in the public domain may be used without the prior permission of the U.S. Department of Labor (DOL). Warning: Some content - including both images and text - may be the copyrighted property of others and used by the DOL under a license.https://www.dol.gov/general/aboutdol/copyrightCYCLOPENTADIENEhttps://www.osha.gov/chemicaldata/401
- Risk Assessment Information System (RAIS)LICENSEThis work has been sponsored by the U.S. Department of Energy (DOE), Office of Environmental Management, Oak Ridge Operations (ORO) Office through a joint collaboration between United Cleanup Oak Ridge LLC (UCOR), Oak Ridge National Laboratory (ORNL), and The University of Tennessee, Ecology and Evolutionary Biology, The Institute for Environmental Modeling (TIEM). All rights reserved.https://rais.ornl.gov/Cyclopentadienehttps://rais.ornl.gov/cgi-bin/tools/TOX_search
- The National Institute for Occupational Safety and Health (NIOSH)LICENSEThe information provided using CDC Web site is only intended to be general summary information to the public. It is not intended to take the place of either the written law or regulations.https://www.cdc.gov/Other/disclaimer.html1,3-Cyclopentadienehttps://www.cdc.gov/niosh-rtecs/GYF4240.htmlCyclopentadienehttps://www.cdc.gov/niosh/npg/npgd0170.html
- Haz-Map, Information on Hazardous Chemicals and Occupational DiseasesLICENSECopyright (c) 2022 Haz-Map(R). All rights reserved. Unless otherwise indicated, all materials from Haz-Map are copyrighted by Haz-Map(R). No part of these materials, either text or image may be used for any purpose other than for personal use. Therefore, reproduction, modification, storage in a retrieval system or retransmission, in any form or by any means, electronic, mechanical or otherwise, for reasons other than personal use, is strictly prohibited without prior written permission.https://haz-map.com/AboutCyclopentadienehttps://haz-map.com/Agents/386
- ChEBICyclopentadienehttps://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:30664
- LOTUS - the natural products occurrence databaseLICENSEThe code for LOTUS is released under the GNU General Public License v3.0.https://lotus.nprod.net/Cyclopentadienehttps://www.wikidata.org/wiki/Q424390LOTUS Treehttps://lotus.naturalproducts.net/
- ChEMBLLICENSEAccess to the web interface of ChEMBL is made under the EBI's Terms of Use (http://www.ebi.ac.uk/Information/termsofuse.html). The ChEMBL data is made available on a Creative Commons Attribution-Share Alike 3.0 Unported License (http://creativecommons.org/licenses/by-sa/3.0/).http://www.ebi.ac.uk/Information/termsofuse.html
- Crystallography Open Database (COD)LICENSEAll data in the COD and the database itself are dedicated to the public domain and licensed under the CC0 License. Users of the data should acknowledge the original authors of the structural data.https://creativecommons.org/publicdomain/zero/1.0/
- NITE-CMC1,3-Cyclopentadiene - FY2006 (New/original classication)https://www.chem-info.nite.go.jp/chem/english/ghs/06-imcg-0761e.htmlCyclopentadiene - FY2019 (Revised classification)https://www.chem-info.nite.go.jp/chem/english/ghs/19-mhlw-2025e.htmlCyclopentadiene - FY2014 (Revised classification)https://www.chem-info.nite.go.jp/chem/english/ghs/14-mhlw-2043e.html
- IUPAC Digitized pKa DatasetCyclopentadienehttps://github.com/IUPAC/Dissociation-Constants
- Japan Chemical Substance Dictionary (Nikkaji)
- KNApSAcK Species-Metabolite Database
- Metabolomics Workbench
- Nature Chemical Biology
- Nature Chemistry
- NIOSH Manual of Analytical MethodsLICENSEThe information provided using CDC Web site is only intended to be general summary information to the public. It is not intended to take the place of either the written law or regulations.https://www.cdc.gov/Other/disclaimer.html
- NIST Mass Spectrometry Data CenterLICENSEData covered by the Standard Reference Data Act of 1968 as amended.https://www.nist.gov/srd/public-law1,3-Cyclopentadienehttp://www.nist.gov/srd/nist1a.cfm
- SpectraBase1,3-CYCLOPENTADIENEhttps://spectrabase.com/spectrum/JjOvbitOHIl1,3-Cyclopentadienehttps://spectrabase.com/spectrum/CBzAMETEV6o1,3-CYCLOPENTADIENEhttps://spectrabase.com/spectrum/5fCUhaXpnnUCyclopentadienehttps://spectrabase.com/spectrum/JwtPjSyqy7E
- NMRShiftDB
- Springer Nature
- SpringerMaterialscyclopenta-1,3-dienehttps://materials.springer.com/substanceprofile/docs/smsid_xugzjwqopcekagqr
- Thieme ChemistryLICENSEThe Thieme Chemistry contribution within PubChem is provided under a CC-BY-NC-ND 4.0 license, unless otherwise stated.https://creativecommons.org/licenses/by-nc-nd/4.0/
- Wikidatacyclopentadienehttps://www.wikidata.org/wiki/Q424390
- WikipediaCyclopentadienehttps://en.wikipedia.org/wiki/Cyclopentadiene
- Wiley
- Medical Subject Headings (MeSH)LICENSEWorks produced by the U.S. government are not subject to copyright protection in the United States. Any such works found on National Library of Medicine (NLM) Web sites may be freely used or reproduced without permission in the U.S.https://www.nlm.nih.gov/copyright.htmlCyclopentaneshttps://www.ncbi.nlm.nih.gov/mesh/68003517
- PubChem
- GHS Classification (UNECE)GHS Classification Treehttp://www.unece.org/trans/danger/publi/ghs/ghs_welcome_e.html
- NORMAN Suspect List ExchangeLICENSEData: CC-BY 4.0; Code (hosted by ECI, LCSB): Artistic-2.0https://creativecommons.org/licenses/by/4.0/NORMAN Suspect List Exchange Classificationhttps://www.norman-network.com/nds/SLE/
- EPA Substance Registry ServicesEPA SRS List Classificationhttps://sor.epa.gov/sor_internet/registry/substreg/LandingPage.do
- MolGenieMolGenie Organic Chemistry Ontologyhttps://github.com/MolGenie/ontology/
- PATENTSCOPE (WIPO)SID 403030037https://pubchem.ncbi.nlm.nih.gov/substance/403030037