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HomeProduct name list1,3,5,7-Cyclooctatetraene

1,3,5,7-Cyclooctatetraene

Synonym(s):[8]Annulene;Cancer Osaka thyroid oncogene;C-COT;COT proto-oncogene serine/threonine-protein kinase;TPL-2

  • CAS NO.:629-20-9
  • Empirical Formula: C8H8
  • Molecular Weight: 104.15
  • MDL number: MFCD00004161
  • EINECS: 211-080-3
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2023-12-26 11:30:52
1,3,5,7-Cyclooctatetraene Structural

What is 1,3,5,7-Cyclooctatetraene?

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.

The Uses of 1,3,5,7-Cyclooctatetraene

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.

The Uses of 1,3,5,7-Cyclooctatetraene

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

The Uses of 1,3,5,7-Cyclooctatetraene

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.

What are the applications of Application

Cyclooctatetraene is an anti-aromatic hydrocarbon with polyolefin-like behavior

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.]

Properties of 1,3,5,7-Cyclooctatetraene

Melting point: -5--3 °C (lit.)
Boiling point: 142-143 °C (lit.)
Density  0.925 g/mL at 25 °C (lit.)
refractive index  n20/D 1.537(lit.)
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
Water Solubility  Not miscible or difficult to mix in water.
Sensitive  Light Sensitive
BRN  2496800
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.
CAS DataBase Reference 629-20-9(CAS DataBase Reference)
EPA Substance Registry System 1,3,5,7-Cyclooctatetraene (629-20-9)

Safety information for 1,3,5,7-Cyclooctatetraene

Signal word Danger
Pictogram(s)
ghs
Flame
Flammables
GHS02
ghs
Exclamation Mark
Irritant
GHS07
ghs
Health Hazard
GHS08
GHS Hazard Statements H225:Flammable liquids
H304:Aspiration hazard
H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233:Keep container tightly closed.
P331:Do NOT induce vomiting.
P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for 1,3,5,7-Cyclooctatetraene

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