1,3,5,7-Cyclooctatetraene
- CAS No.
- 629-20-9
- Chemical Name:
- 1,3,5,7-Cyclooctatetraene
- Synonyms
- CYCLOOCTATETRAENE;COT;[8]Annulene;ESTF;C-COT;TPL-2;1,3,5,7-c;1,3,5,7-COT;Cot active mouse;CycloctateTraene.
- CBNumber:
- CB7164468
- Molecular Formula:
- C8H8
- Molecular Weight:
- 104.15
- MDL Number:
- MFCD00004161
- MOL File:
- 629-20-9.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Product description | Number | Pack Size | Price |
| Cyclooctatetraene 98% | 138924 | 1g | $67.9 |
| Cyclooctatetraene 98% | 138924 | 5g | $218 |
| Cot active mouse recombinant, expressed in baculovirus infected Sf9 cells, ≥50% (SDS-PAGE) | SRP0363 | 10 μg | $607 |
| Anti-COT antibody produced in rabbit affinity isolated antibody | SAB4500410 | 100μG | $392 |
| Anti-Crot (C-terminal) antibody produced in goat affinity isolated antibody, buffered aqueous solution | SAB2501715 | 100μg | $586 |
| More product size | |||
| Melting point | ?5-?3 °C (lit.) |
|---|---|
| Boiling point | 142-143 °C (lit.) |
| Density | 0.925 g/mL at 25 °C (lit.) |
| refractive index |
n |
| Flash point | 72 °F |
| storage temp. | -20°C |
| solubility | Chloroform (Soluble), Methanol (Soluble) |
| form | Liquid |
| Specific Gravity | 0.943 |
| color | Turbid yellow to yellow-brown |
| biological source | rabbit |
| Water Solubility | Not miscible or difficult to mix in water. |
| Sensitive | Light Sensitive |
| BRN | 2496800 |
| Henry's Law Constant | 3.6×10-2 mol/(m3Pa) at 25℃, Hilal et al. (2008) |
| Dielectric constant | 2.46 |
| Stability | Stability Unstable - commercial product may be stabilized by the addition of a small amount of hydroquinone. May form explosive peroxides in storage. Do not distill to small volume. Readily forms explosive mixtures with air. Flammable. Incompatible with air, strong oxidizing agents. |
| InChI | 1S/C8H8/c1-2-4-6-8-7-5-3-1/h1-8H/b2-1-,3-1-,4-2-,5-3-,6-4-,7-5-,8-6-,8-7- |
| InChIKey | KDUIUFJBNGTBMD-BONZMOEMSA-N |
| SMILES | C1=CC=CC=CC=C1 |
| LogP | 3.080 |
| CAS DataBase Reference | 629-20-9(CAS DataBase Reference) |
| FDA UNII | AJ19R479CQ |
| EPA Substance Registry System | 1,3,5,7-Cyclooctatetraene (629-20-9) |
| UNSPSC Code | 12352203 |
| NACRES | NA.41 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |    GHS02,GHS07,GHS08 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H315-H319-H304-H412-H225 | |||||||||
| Precautionary statements | P501-P273-P240-P210-P233-P243-P241-P242-P264-P280-P370+P378-P331-P337+P313-P305+P351+P338-P362+P364-P303+P361+P353-P332+P313-P301+P310-P403+P235-P405 | |||||||||
| target organs | Respiratory system | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter | |||||||||
| Hazard Codes | Xn,Xi,T | |||||||||
| Risk Statements | 10-36/37/38-65-61 | |||||||||
| Safety Statements | 26-62-45-53 | |||||||||
| RIDADR | UN 2358 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | GY0175600 | |||||||||
| F | 8-10 | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 3 | |||||||||
| PackingGroup | II | |||||||||
| HS Code | 29021900 | |||||||||
| Storage Class | 3 - Flammable liquids | |||||||||
| Hazard Classifications | Aquatic Chronic 3 Asp. Tox. 1 Eye Irrit. 2 Flam. Liq. 2 Skin Irrit. 2 STOT SE 3 |
|||||||||
| Limited Quantities | 1.0 L (0.3 gallon) (liquid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml) | |||||||||
| NFPA 704 |
|
1,3,5,7-Cyclooctatetraene price More Price(33)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 138924 | Cyclooctatetraene 98% | 629-20-9 | 1g | $67.9 | 2026-04-30 | Buy |
| Sigma-Aldrich | 138924 | Cyclooctatetraene 98% | 629-20-9 | 5g | $218 | 2026-04-30 | Buy |
| Sigma-Aldrich | SRP0363 | Cot active mouse recombinant, expressed in baculovirus infected Sf9 cells, ≥50% (SDS-PAGE) | 10 μg | $607 | 2025-07-31 | Buy | |
| Sigma-Aldrich | SAB4500410 | Anti-COT antibody produced in rabbit affinity isolated antibody | 629-20-9 | 100μG | $392 | 2025-07-31 | Buy |
| Sigma-Aldrich | SAB2501715 | Anti-Crot (C-terminal) antibody produced in goat affinity isolated antibody, buffered aqueous solution | 100μg | $586 | 2025-07-31 | Buy |
1,3,5,7-Cyclooctatetraene Chemical Properties,Uses,Production
Chemical Properties
1,3,5,7-Cyclooctatetraene (COT) is an unsaturated derivative of cyclooctane, with the formula C8H8. It is also known as [8]annulene. This polyunsaturated hydrocarbon is a colorless to light yellow flammable liquid at room temperature. Because of its stoichiometric relationship to benzene, COT has been the subject of much research and some controversy.
Physical properties
Cyclooctatetraene (COT) is a poster child for nonaromatic molecules. An isomer of tub-shaped COT, with one of the ring double bonds changed from the usual cis form to a trans one, lies some 23 kcal/mol higher in energy.
Cyclooctatetraene is an 8p electron system and has a triplet ground state if the p electrons are delocalized. It is antiaromatic hence highly unstable and reactive. It adopts a non-planar boat conformation to attain stability with alternating single and double bonds and hence behaves like a polyolefin.
Cyclooctatetraene is a nonaromatic 4n π-conjugated system with a non-planar tub-shaped geometry and potential energy surfaces at the ground state.
Uses
1,3,5,7-Cyclooctatetraene is used in the synthesis of highly organic film for silicon surfaces to improve its chemical and physical properties. It is also used in liquid state organic dye lasers, as triplet state quencher to reduce dye blinking.
Uses
Used in the synthesis of highly organic film for silicon surfaces to improve its chemical and physical properties. 1 Used in liquid state organic dye lasers. 2 Used as triplet state quencher to reduce dye blinking. 3
Uses
COT may be functionalized by two side groups which can be used as active anode materials for rechargeable batteries. High capacity and voltage organic cathodes may be developed by using COT that can be fused with carbon molecules.
Definition
ChEBI: An antiaromatic annulene that is cyclooctane having four double bonds at positions 1, 3, 5 and 7.
Synthesis Reference(s)
Tetrahedron Letters, 21, p. 4791, 1980 DOI: 10.1016/0040-4039(80)80141-9
General Description
A colorless liquid. May irritate skin and eyes. Less dense than water and insoluble in water. Flash point 70°F. Vapors heavier than air. Used to make rubber.
Air & Water Reactions
Highly flammable. Insoluble in water.
Reactivity Profile
1,3,5,7-CYCLOOCTATETRAENE may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas.
Health Hazard
Inhalation or contact with material may irritate or burn skin and eyes. Fire may produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Purification Methods
Purify the triene by shaking 3mL with 20mL of 10% aqueous AgNO3 for 15minutes, then filtering off the AgNO3 complex which precipitates. The precipitate is dissolved in water and added to cold concentrated ammonia to regenerate the cyclooctatetraene which is fractionally distilled under vacuum onto molecular sieves and stored at 0o. It is passed through a dry alumina column before use [Broadley et al. J Chem Soc, Dalton Trans 373 1986]. [Beilstein 5 I 228, 5 IV 1331.]
1,3,5,7-Cyclooctatetraene Preparation Products And Raw materials
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Henan Fengda Chemical Co., Ltd | +86-371-86557731 +86-13613820652 | info@fdachem.com | China | 20120 | 58 |
| SHANGHAI T&W PHARMACEUTICAL CO., LTD. | +86-021-61551413 +8618813727289 | contact@trustwe.com | China | 5746 | 58 |
| Career Henan Chemica Co | +86-0371-86658258 +8613203830695 | laboratory@coreychem.com | China | 30224 | 58 |
| Shaanxi Didu New Materials Co. Ltd | +86-86-17392712779 +8617792793228 | 1090@dideu.com | China | 8660 | 58 |
| PT CHEM GROUP LIMITED | +86-85511178; | peter68@ptchemgroup.com | China | 35425 | 58 |
| HANGZHOU LEAP CHEM CO., LTD. | +86-571-87711850 | market18@leapchem.com | China | 43333 | 58 |
| Aladdin Scientific | tp@aladdinsci.com | United States | 57505 | 58 | |
| SHANGHAI KEAN TECHNOLOGY CO., LTD. | +8613817748580 | cooperation@kean-chem.com | China | 40066 | 58 |
| XIAMEN AMITY INDUSTRY AND TRADE CO., LTD. | +8618950047208 | ellena@amitychem.com | China | 43414 | 58 |
| DAYANG CHEM (HANGZHOU) CO.,LTD | +86-88938639 +86-17705817739 | info@dycnchem.com | China | 53803 | 58 |
View Lastest Price from 1,3,5,7-Cyclooctatetraene manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-07-09 | 1,3,5,7-Cyclooctatetraene
629-20-9
|
$1.00-100.00 | 1KG | 99% | Henan Fengda Chemical Co., Ltd |
-
- 1,3,5,7-Cyclooctatetraene
629-20-9
- $1.00-100.00
- 99%
- Henan Fengda Chemical Co., Ltd
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