Cyclopenten

Bezeichnung:Cyclopenten

CAS-Nr142-29-0

Englisch Name:Cyclopentene

CBNumberCB7231452

SummenformelC5H8

Molgewicht68.12

MOL-Datei142-29-0.mol

Synonyma

Cyclopenten

Cyclopenten physikalisch-chemischer Eigenschaften

Schmelzpunkt	−135 °C(lit.)
Siedepunkt	44-46 °C(lit.)
Dichte	0.771 g/mL at 25 °C(lit.)
Dampfdruck	20.89 psi ( 55 °C)
Brechungsindex	n20/D 1.421(lit.)
Flammpunkt	<−30 °F
storage temp.	0-6°C
Löslichkeit	water: soluble0.535g/L at 25°C
Aggregatzustand	Liquid
Wichte	0.771
Farbe	Colorless
Wasserlöslichkeit	immiscible
Sensitive	Air Sensitive
BRN	635707
Henry's Law Constant	6.3 x 10^-2 atm?m³/mol at 25 °C (Hine and Mookerjee, 1975)
Stabilität	Stable. Highly flammable. Incompatible with strong oxidizing agents. Store cold.
InChIKey	LPIQUOYDBNQMRZ-UHFFFAOYSA-N
LogP	2.47 at 25℃
CAS Datenbank	142-29-0(CAS DataBase Reference)
NIST chemische Informationen	Cyclopentene(142-29-0)
EPA chemische Informationen	Cyclopentene (142-29-0)

Sicherheit

Kennzeichnung gefährlicher	F,Xn
R-Sätze:	11-21/22-36/37/38-65-67-52/53-38
S-Sätze:	9-16-26-33-36-62-61-36/37
RIDADR	UN 2246 3/PG 2
WGK Germany	3
RTECS-Nr.	GY5950000
F	10-23
Selbstentzündungstemperatur	743 °F
TSCA	Yes
HazardClass	3
PackingGroup	II
HS Code	29021990
Toxizität	Acute oral LD₅₀ for rats is 1,656 mg/kg (quoted, RTECS, 1985).

Gefahreninformationscode (GHS)

Cyclopentene Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R11:Leichtentzündlich.
R21/22:Gesundheitsschädlich bei Berührung mit der Haut und beim Verschlucken.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R65:Gesundheitsschädlich: kann beim Verschlucken Lungenschäden verursachen.
R67:Dämpfe können Schläfrigkeit und Benommenheit verursachen.
R52/53:Schädlich für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
S-Sätze Betriebsanweisung:
S9:Behälter an einem gut gelüfteten Ort aufbewahren.
S16:Von Zündquellen fernhalten - Nicht rauchen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S33:Maßnahmen gegen elektrostatische Aufladungen treffen.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S62:Bei Verschlucken kein Erbrechen herbeiführen. Sofort ärztlichen Rat einholen und Verpackung oder dieses Etikett vorzeigen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
Chemische Eigenschaften
Cyclopentene is a highly flammable liquid with a low flash point. It reacts readily with oxidizing agents.
Physikalische Eigenschaften
Clear, colorless, watery, very flammable liquid with a characteristic sweet, petroleum-like odor.
Verwenden
Cyclopentene is a cycloalkene that is cyclopentane having one endocyclic double bond. Vapors heavier than air. Inhalation of high concentrations may be narcotic. Used to make rubber and plastics. Neopentyl phosphine ligand catalyzed Heck coupling of cyclopentene has been reported. Mechanism of reaction of ground state oxygen atom with cyclopentene has been investigated. Homopolymerization of cyclopentene has been reported. Photocatalytic oxidation of cyclopentene over various titanium(IV) oxide catalyst has been reported. Cyclopentene was used to investigate the [2+2] cycloaddition of diamond (001) surfaces with alkene.
Verwenden
Cyclopentene is used in organic synthesis for cross-linking resin. It is used as an intermediate in Industries such as Agrochemical, Dyestuff, Pharmaceutical, syntheses material, Chemical. It is used as a monomer for synthesis of plastics and rubber. It is also used for the synthesis of various chemicals, such as 1,1,2-Trimethylcyclohexane.
Definition
ChEBI: Cyclopentene is a cycloalkene that is cyclopentane having one endocyclic double bond.
synthetische
Cyclopentene is synthesized by selective hydrogenation of cyclopentadiene or by dehydration of cyclopentanol. It is produced industrially in large amounts by steam cracking of naphtha. Cyclopentene is present in coal tar, cigarette smoke, and automobile emissions.
Allgemeine Beschreibung
Cyclopentene appears as a colorless liquid. Less dense than water and insoluble in water. Flash point below 0°F. Vapors heavier than air. Inhalation of high concentrations may be narcotic. Used to make rubber and plastics.
Air & Water Reaktionen
Highly flammable. Insoluble in water.
Reaktivität anzeigen
Cyclopentene may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.
Health Hazard
May be harmful by inhalation, ingestion, or skin absorption. May cause eye and skin irritation.
Brandgefahr
Special Hazards of Combustion Products: Vapor may travel considerable distance to a source of ignition and flashback. Explosion may occur under fire condition.
Sicherheitsprofil
Moderately toxic by ingestion and skin contact. A very dangerous fire hazard when exposed to flame or heat; can react with oxidning materials. Keep away from heat and open flame. To fight fire, use foam, CO2, dry chemical.
Source
Schauer et al. (2001) measured organic compound emission rates for volatile organic compounds, gas-phase semi-volatile organic compounds, and particle-phase organic compounds from the residential (fireplace) combustion of pine, oak, and eucalyptus. The gas-phase emission rate of cyclopentene was 7.8 mg/kg of pine burned. Emission rates of cyclopentene were not measured during the combustion of oak and eucalyptus.
California Phase II reformulated gasoline contained cyclopentene at a concentration of 1,120 mg/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 480 and 31,700 μg/km, respectively (Schauer et al., 2002).
Given that cyclopentene is prepared from cyclohepentanol, the latter may be present as an impurity.
Environmental Fate
Biological. Cyclopentene may be oxidized by microbes to cyclopentanol, which may oxidize to cyclopentanone (Dugan, 1972).
Photolytic. The following rate constants were reported for the reaction of cyclopentene with OH radicals in the atmosphere: 6.39 x 10^-11 cm³/molecule?sec (Atkinson et al., 1983), 4.99 x 10^-11 cm³/molecule?sec at 298 K (Rogers, 1989), 4.0 x 10^-10 cm³/molecule?sec (Atkinson, 1990) and 6.70 x 10^-11 cm³/molecule?sec (Sablji? and Güsten, 1990); with ozone in the atmosphere: 8.13 x 10^-16 at 298 K (Japar et al., 1974) and 9.69 x 10^-16 cm³/molecule?sec at 294 K (Adeniji et al., 1981); with NO3 in the atmosphere: 4.6 x 10^-13 cm³/molecule?sec at 298 K (Atkinson, 1990) and 5.81 x 10^-13 cm³/molecule?sec at 298 K (Sablji? and Güsten, 1990).
Chemical/Physical. Gaseous products formed from the reaction of cyclopentene with ozone were (% yield): formic acid, carbon monoxide, carbon dioxide, ethylene , formaldehyde, and butanal. Particulate products identified include succinic acid, glutaraldehyde, 5-oxopentanoic acid, and glutaric acid (Hatakeyama et al., 1987).
At elevated temperatures, rupture of the C-C bond occurs forming molecular hydrogen and cyclopentadiene (95% yield) as the principal products (Rice and Murphy, 1942).
läuterung methode
Free cyclopentene from hydroperoxide by refluxing with cupric stearate. Fractionally distil it from Na. It can be chromatographed on a Dowex 710-Chromosorb W GLC column. Methods for cyclohexene should be applicable here. Also, it has been washed with 1M NaOH solution followed by water. It was dried over anhydrous Na2SO4, distilled over powdered NaOH under nitrogen, and passed through neutral alumina before use [Woon et al. J Am Chem Soc 108 7990 1986]. It was distilled in a dry nitrogen atmosphere from powdered fused NaOH through a Vigreux column (p 11), and then passed through activated neutral alumina before use [Wong et al. J Am Chem Soc 109 3428 1987]. [Beilstein 5 IV 209.]
Toxicity evaluation
Acute Toxicity. The oral LD50 in the rat is 1656 mL/kg, and the dermal LD50 in the rabbit is 1231 mL/kg. Inhalation of the concentrated vapor was lethal to rats in 5min, and a 4 h exposure to 16,000 ppm was lethal to four of six rats.
Chronic and Subchronic Toxicity. Chronic exposure of rats to 112–1139 ppm for 12 weeks showed no effects, whereas 8110 ppm for 6 h/day, 5 days/week for 3 weeks resulted in decreased body weight gains of female rats.
Human Experience
General Information. Short-term exposure of cyclopentene to humans revealed a tolerable level of only 10–15 ppm.

Cyclopentene Upstream-Materialien And Downstream Produkte

Cyclopenten Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

142-29-0, Cyclopentene Verwandte Suche:

Send Inquriy