Циклопентена

Химические свойства

Cyclopentene is a highly flammable liquid with a low flash point. It reacts readily with oxidizing agents.

Физические свойства

Clear, colorless, watery, very flammable liquid with a characteristic sweet, petroleum-like odor.

Использование

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.

Определение

ChEBI: Cyclopentene is a cycloalkene that is cyclopentane having one endocyclic double bond.

Подготовка

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.

Общее описание

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.

Реакции воздуха и воды

Highly flammable. Insoluble in water.

Профиль реактивности

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.

Угроза здоровью

May be harmful by inhalation, ingestion, or skin absorption. May cause eye and skin irritation.

Пожароопасность

Special Hazards of Combustion Products: Vapor may travel considerable distance to a source of ignition and flashback. Explosion may occur under fire condition.

Профиль безопасности

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.

Экологическая судьба

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).

Методы очистки

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.]