- Cyclopentene
- Cyclopentene oxide
- Cyclopentene, 3-butyl-
- Cyclopentene, 3-ethyl-
- Cyclopentene, 3-methyl-
- Cyclopentene, 4-methyl-
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Cas Database |
| Name |
Cyclopentene |
EINECS | 205-532-9 |
| CAS No. | 142-29-0 | Density | 0.831 g/cm3 |
| PSA | 0.00000 | LogP | 1.72650 |
| Solubility | immiscible with water | Melting Point |
-135 °C |
| Formula | C5H8 | Boiling Point | 44.2 °C at 760 mmHg |
| Molecular Weight | 68.1185 | Flash Point | <−30°F |
| Transport Information | UN 2246 3/PG 2 | Appearance | colourless liquid with a petrol-like odour |
| Safety | 9-16-26-33-36-62-61-36/37 | Risk Codes | 11-21/22-36/37/38-65-67-52/53 |
| Molecular Structure |
|
Hazard Symbols |
 F, Xn
|
| Synonyms |
NSC5160; |
Article Data | 296 |
Cyclopentene Synthetic route
| Conditions | Yield |
|---|---|
| With sodium amalgam; chiral Co(II) In tetrahydrofuran-d8 at 20℃; for 6h; deoxygenation; | 100% |
| With triphenylphosphine at 200℃; for 8.5h; | 59% |
| With trifluoroacetic acid; selenobenzamide In dichloromethane at 20℃; for 30h; Mechanism; With other reagents are dicussed.; | 85 % Chromat. |
| Conditions | Yield |
|---|---|
| With 18-crown-6 ether; potassium bromide Product distribution; Substitution; elimination; | A 89% B 100% C 1.5% D 3.5% |
| Conditions | Yield |
|---|---|
| With hydrogen; palladium In methanol at 30℃; under 760 Torr; Rate constant; Product distribution; Thermodynamic data; mechanism of reaction, var. solvents, var. amount of catalyst, var. catalysts, var. conc., var. pressure, eq. constants, activation energy; | 97.1% |
| With hydrogen; Ruthenium deposition on Pd/Cu at 199.9℃; Rate constant; effect of catalyst content on the rate on the yield; | 3% |
| With hydrogen; ruthenium at 49.9℃; under 140 Torr; Product distribution; variation of temperature; |
- 77861-36-0
C17H17N3O8S2
A
- 4009-06-7
(4-nitro-N-((4-nitrophenyl)sulfonyl)benzenesulfonamide)
B
- 142-29-0
cyclopentene
| Conditions | Yield |
|---|---|
| In neat (no solvent) at 175℃; for 0.5h; | A 95% B 90% |
| Conditions | Yield |
|---|---|
| tert-butylhydroquinone In diphenylether at 215℃; for 2.58333h; Product distribution / selectivity; | 94.19% |
| Conditions | Yield |
|---|---|
| With nickel(II) oxide; 1-methyl-2-nitrobenzene; oxalic acid at 280 - 310℃; for 3.16667h; Temperature; | 92% |
| With 5,6,8,9-tetrahydro-7-phenyldibenzoxanthenylium tetrafluoroborate In dichloromethane at 20℃; for 27h; |
| Conditions | Yield |
|---|---|
| With formic acid at 20 - 240℃; Inert atmosphere; | 86% |
- 142-29-0
cyclopentene
| Conditions | Yield |
|---|---|
| With n-butyllithium In diethyl ether; pentane 1.) -78 deg C; 2.) 25 deg C over 1 h; | 85% |
| With n-butyllithium | 85% |
| Conditions | Yield |
|---|---|
| With [i-PrNDI]Ni2(C6H6); 1,3,5-trimethyl-benzene In benzene for 24h; Reagent/catalyst; Inert atmosphere; Glovebox; regioselective reaction; | 83% |
| at 526.9℃; Rate constant; pyrolysis, other temperature; | |
| at 341.2℃; under 485 - 500 Torr; Rate constant; Mechanism; | |
| at 303.9 - 780.9℃; Kinetics; |
- 112-17-4
n-decyl acetate
A
- 592-41-6
1-hexene
B
- 872-05-9
1-Decene
C
- 822-50-4, 1192-18-3, 13012-46-9, 134932-08-4, 2452-99-5
1,2-dimethylcyclopentane
D
- 2511-92-4
1-Butyl-2-methylcyclopropane
E
- 41977-37-1
1-Methyl-2-pentylcyclopropane
F
- 142-29-0
cyclopentene
| Conditions | Yield |
|---|---|
| at 495℃; for 0.00727778h; Rate constant; Product distribution; various temp., also in toluene, also with 14C-labelled ester; | A 1.03% B 81.3% C 1.91% D 1.2% E 0.497% F 0.45% |
Cyclopentene Chemical Properties
Product Name: Cyclopentene (CAS NO.142-29-0)
Molecular Formula: C5H8
Molecular Weight: 68.117
Index of Refraction: 1.464
Molar Refractivity: 22.66 cm3
Molar Volume: 82 cm3
Surface Tension: 29.7 dyne/cm
Density: 0.83 g/cm3
Enthalpy of Vaporization: 27.63 kJ/mol
Boiling Point: 44.2 °C at 760 mmHg
Vapour Pressure: 378 mmHg at 25°C
Appearance: colorless liquid with a petrol-like odor
XLogP3-AA: 1.9
H-Bond Donor: 0
H-Bond Acceptor: 0
Structure Descriptors of Cyclopentene (CAS NO.142-29-0):
IUPAC Name: cyclopentene
Canonical SMILES: C1CC=CC1
InChI: InChI=1S/C5H8/c1-2-4-5-3-1/h1-2H,3-5H2
InChIKey: LPIQUOYDBNQMRZ-UHFFFAOYSA-N
Product Categories: Pharmaceutical Intermediates; Alkenes; Cyclic; Organic Building Blocks
Cyclopentene Uses
Cyclopentene (CAS NO.142-29-0) is used as a monomer for synthesis of plastics, and in a number of chemical syntheses.
Cyclopentene Production
It can be obtained from vinylcyclopropane in the vinylcyclopropane-cyclopentene rearrangement.
Cyclopentene Toxicity Data With Reference
| 1. | orl-rat LD50:1656 mg/kg | AIHAAP American Industrial Hygiene Association Journal. 30 (1969),470. | ||
| 2. | skn-rbt LD50:1231 mg/kg | AIHAAP American Industrial Hygiene Association Journal. 30 (1969),470. |
Cyclopentene Consensus Reports
Reported in EPA TSCA Inventory.
Cyclopentene Safety Profile
Moderately toxic by ingestion and skin contact. A very dangerous fire hazard when exposed to flame or heat; can react with oxidizing materials. Keep away from heat and open flame. To fight fire, use foam, CO2, dry chemical.
Hazard Codes: 
F,
Xn
Risk Statements: 11-21/22-36/37/38-65-67-52/53
R11:Highly flammable.
R21/22:Harmful in contact with skin and if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin.
R65:Harmful: may cause lung damage if swallowed.
R67:Vapours may cause drowsiness and dizziness.
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 9-16-26-33-36-62-61-36/37
S9:Keep container in a well-ventilated place.
S16:Keep away from sources of ignition.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S33:Take precautionary measures against static discharges.
S36:Wear suitable protective clothing.
S62:If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label.
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
S36/37:Wear suitable protective clothing and gloves.
RIDADR: UN 2246 3/PG 2
WGK Germany: 3
RTECS: GY5950000
F: 10-23
HazardClass: 3
PackingGroup: II
Cyclopentene Standards and Recommendations
DOT Classification: 3; Label: Flammable Liquid
Cyclopentene Specification
The Cas Register Number of Cyclopentene is 142-29-0 .The chemical synonyms of Cyclopentene (CAS NO.142-29-0) are 3-cyclopentene cyclopentene ; Cyclopentene ; 1-Cyclopentene ; Cyclopent-1-ene .
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