Cyclohexene
Cyclohexene
CAS: 110-83-8
Molecular Formula: C6H10
Cyclohexene - Names and Identifiers
| Name | Cyclohexene |
| Synonyms | HX CYCLOHEXENE Cyclohexene Hexanaphthylene TETRAHYDROBENZENE tetrahydro-benzen cykloheksen(polish) BENZENETETRAHYDRIDE 1,2,3,4-TETRAHYDROBENZENE |
| CAS | 110-83-8 |
| EINECS | 203-807-8 |
| InChI | InChI=1/C6H10/c1-2-4-6-5-3-1/h1-2H,3-6H2 |
| InChIKey | HGCIXCUEYOPUTN-UHFFFAOYSA-N |
Cyclohexene - Physico-chemical Properties
| Molecular Formula | C6H10 |
| Molar Mass | 82.14 |
| Density | 0.811 g/mL at 25 °C (lit.) |
| Melting Point | -104 °C (lit.) |
| Boling Point | 83 °C (lit.) |
| Flash Point | 10°F |
| Water Solubility | insoluble |
| Solubility | water: insoluble |
| Vapor Presure | 160 mm Hg ( 20 °C) |
| Vapor Density | 2.8 (vs air) |
| Appearance | Liquid |
| Specific Gravity | 0.811 |
| Color | Clear colorless |
| Exposure Limit | TLV-TWA 300 ppm (～1015 mg/m3)(ACGIH, OSHA, and NIOSH); IDLH10,000 ppm (NIOSH). |
| Merck | 14,2727 |
| BRN | 906737 |
| PH | 7-8 (0.2g/l, H2O, 20℃) |
| Storage Condition | Store below +30°C. |
| Stability | Stable in the absence of air - may form peroxides in storage. Incompatible with oxidizing agents. Highly flammable. |
| Explosive Limit | 1.2-7.7%(V) |
| Refractive Index | n20/D 1.446(lit.) |
| Physical and Chemical Properties | Colorless flammable liquid with special pungent odor solubility insoluble in water, soluble in ether. |
| Use | Used in organic synthesis and also as a solvent |
Cyclohexene - Risk and Safety
| Risk Codes | R11 - Highly Flammable R21/22 - Harmful in contact with skin and if swallowed. R65 - Harmful: May cause lung damage if swallowed |
| Safety Description | S16 - Keep away from sources of ignition. S29 - Do not empty into drains. S33 - Take precautionary measures against static discharges. S36/37 - Wear suitable protective clothing and gloves. S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. |
| UN IDs | UN 2256 3/PG 2 |
| WGK Germany | 1 |
| RTECS | GW2500000 |
| TSCA | Yes |
| HS Code | 29021990 |
| Hazard Class | 3 |
| Packing Group | II |
| Toxicity | LD50 orally in Rabbit: 1300 mg/kg |
Cyclohexene - Upstream Downstream Industry
Cyclohexene - Nature
Open Data Verified Data
colorless flammable liquid, insoluble in water, soluble in ether. The relative density was 0.81096. Melting Point -103.5 °c. Boiling point 83. Flash point -11. 67 °c. The number of aniline 10. Refractive index 44654.
Last Update：2025-06-10 22:55:16
Cyclohexene - Preparation Method
Open Data Verified Data
cyclohexene is formed from cyclohexanol by heating in the presence of sulfuric acid as a catalyst, and a crude product is obtained by distillation. Then the refined salt saturated liquid is washed, and then the trace acid is neutralized with sodium sulfate solution, and the product cyclohexene is obtained by washing with water, layering, drying, filtering and rectification, and collecting the 82~85 ℃ fraction.
Last Update：2022-01-01 10:38:25
Cyclohexene - Application
Open Data Verified Data
This product is a raw material for organic synthesis, such as the synthesis of lysine, cyclohexanone and phenol, can also be used as catalyst solvent and petroleum extractant.
Last Update：2025-08-19 16:24:40
Cyclohexene - Safety
Open Data Verified Data
- This product has moderate toxicity, and its toxic effect is basically similar to that of cyclohexane, which causes irritation due to its rapid evaporation when splash and skin. When inhaled into the human body, there is an anesthetic effect. The anesthetic effect on warm-blooded animals is fast, but it does not cause intermittent spasms or tremors. It can reduce blood pressure, pulse and respiration. Maximum allowable concentration in air l015mg/m3. The production site should be well ventilated, and the operator should wear protective equipment.
- This product is packaged in glass bottles, each weighing 20kg, and is covered in wooden boxes. Storage at room temperature. This product is flammable, and should be isolated from the fire source during storage and transportation to avoid collision.
Last Update：2025-06-10 22:55:16
Cyclohexene - Reference Information
| Henry's Law Constant | 3.85 x 10-2 atm?m3/mol at 25 °C (Nielsen et al., 1994) |
| LogP | 2.99 at 25℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| cyclic olefin | cyclohexene is a cyclic olefin that is colorless, flammable and has a special pungent odor at room temperature. Long-term storage in air can be oxidized by air to form peroxide. Naturally occurring in coal tar, soluble in acetone, carbon tetrachloride, benzene, ethyl ether, ethanol and hexane and other organic solvents, can be with lower alcohols, acetic acid and other forms of constant boiling matter. Cyclohexene has the general properties of olefins, in the presence of uranium salt in the sun or ultraviolet light in the rapid decomposition, in the sealed tube at 200 deg C for a long time heating unchanged, benzene and naphthalene are formed at 400-500 °c. It is industrially produced by dehydration of cyclohexanol at high temperature in the presence of an acid catalyst. Obtained in the laboratory by dehydration of cyclohexanol by sulfuric acid. Figure 1 is the chemical reaction equation of cyclohexene obtained by dehydration of cyclohexanol with sulfuric acid cyclohexene is an important chemical raw material, which is used in the production of adipic acid, adipic aldehyde, maleic acid, cyclohexanoic acid, cyclohexanal, maleic acid, cyclohexylcarboxylic acid, cyclohexylformaldehyde. It can also be used as an extractant, a stabilizer for gasoline with high octane number. Inhalation can cause mild poisoning. The following are some important compounds prepared from cyclohexene: (1) after the preparation of chlorinated cyclohexane, it can be used as a pharmaceutical intermediate, solvent and rubber additive;(2) after the preparation of cyclohexene to cyclohexanone, can be used as medicine, pesticide, perfume, dye intermediate raw materials, polymer modifier;(3) after cyclohexylacetic acid is made, it can be used as plastic solvent;(4) after cyclohexanol is made, can be used as medicine and pesticide pesticide raw material;(5) made of aminocyclohexanol, can be used as surfactant and emulsifier. (6) This product can also be directly used as organic intermediates, solvents and additives in the preparation of spices; In the laboratory this product can be used for the preparation of butadiene. |
| Use | for organic synthesis, also used as solvent organic synthesis raw materials, such as the synthesis of lysine, cyclohexanone, phenol, polycycloolefin resin, chlorocyclohexane, rubber additives, cyclohexanol raw materials, etc., can also be used as catalyst solvent and petroleum extractant, high octane gasoline stabilizer. preparation of adipic acid, maleic acid, hexahydrobenzoic acid and acetaldehyde. Preparation of butadiene in the laboratory. High-octane gasoline stabilizer. |
| production method | cyclohexene is produced from cyclohexanol by heating in the presence of sulfuric acid as a catalyst, and a crude product is distilled. Then the refined salt saturated liquid is washed, and then the trace acid is neutralized with sodium sulfate solution, and the product cyclohexene is obtained by washing with water, layering, drying, filtering and rectification, and the fraction at 82-85 ° C. Is collected. |
| category | flammable liquid |
| toxicity grade | poisoning |
| Acute toxicity | inhalation-rat TCL0: 600 PPM/ 6 hours/26 weeks |
| explosive hazard characteristics | explosive when mixed with air |
| flammability hazard characteristics | in case of open flame, high temperature, flammable oxidant; Combustion stimulus smoke |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from oxidants and acids; It is not suitable for long storage, to prevent aggregation |
| extinguishing agent | dry powder, dry sand, carbon dioxide, foam, 1211 extinguishing agent |
| Occupational Standard | TWA 1015 mg/m3 |
| spontaneous combustion temperature | 590 ° F. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-and health-threatening concentrations | 2,000 ppm |
Last Update：2024-04-09 20:52:54
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Raw Materials for Cyclohexene