| Identification | More | [Name]
CYCLOPENTANE | [CAS]
287-92-3 | [Synonyms]
CYCLOPENTANE
PENTAMETHYLENE
Cyclopentan
cyclopentane B&J brand 4 L
CYCLOPENTANE, FOR UV-SPECTROSCOPY
CYCLOPENTANE, HPLC GRADE
CYCLOPENTANE, ANHYDROUS
CYCLOPENTANE OEKANAL
CYCLOPENTANE, FOR HPLC
CYCLOPENTANE, STANDARD FOR GC
CYCLOPENTANE 'B&J BRAND' 2.5 L
CYCLOPENTANE, REAGENTPLUS, >=99%
Cyclopentane,Certified
Cyclopentane, 75%, balance other of C5-isomers, for spectroscopy
Cyclopentane, pure, 99%
CYCLOPENTANE TECHNICAL
CYCLOPENTANE,OMNISOLV
Cyclopentane, 99%, pure
CyclopentaneAcroSealExtra Dry | [EINECS(EC#)]
206-016-6 | [Molecular Formula]
C5H10 | [MDL Number]
MFCD00001356 | [Molecular Weight]
70.13 | [MOL File]
287-92-3.mol |
| Chemical Properties | Back Directory | [Appearance]
colourless liquid with a petrol-like smell | [Melting point ]
-94 °C (lit.) | [Boiling point ]
50 °C (lit.) | [density ]
0.751 g/mL at 25 °C(lit.)
| [vapor density ]
~2 (vs air)
| [vapor pressure ]
18.93 psi ( 55 °C)
| [refractive index ]
n20/D 1.405(lit.)
| [Fp ]
−35 °F
| [storage temp. ]
Flammables area | [solubility ]
0.156g/l insoluble | [form ]
Powder | [color ]
White | [Odor]
Like gasoline; mild, sweet. | [Stability:]
Stable. Highly flammable. Note low flash point and wide explosion limits. Incompatible with strong oxidizing agents. Floats on water, so water is of limited value in putting out fires involving this material. | [explosive limit]
1.5-8.7%(V) | [Water Solubility ]
Miscible with ethanol, ether and acetone. Slightly miscible with water. | [λmax]
λ: 198 nm Amax: 1.0
λ: 210 nm Amax: 0.50
λ: 220 nm Amax: 0.10
λ: 240-400 nm Amax: 0.01 | [Merck ]
14,2741 | [BRN ]
1900195 | [Henry's Law Constant]
0.164, 0.240, and 0.300 at 27.9, 35.8, and 45.0 °C, respectively (dynamic headspace, Hansen et al.,
1995) | [Dielectric constant]
1.9（20℃） | [Exposure limits]
TLV-TWA 600 ppm (～1720 mg/m3)
(ACGIH). | [LogP]
3 at 20℃ | [CAS DataBase Reference]
287-92-3(CAS DataBase Reference) | [NIST Chemistry Reference]
Cyclopentane(287-92-3) | [EPA Substance Registry System]
287-92-3(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
F | [Risk Statements ]
R11:Highly Flammable.
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment . | [Safety Statements ]
S9:Keep container in a well-ventilated place .
S16:Keep away from sources of ignition-No smoking .
S29:Do not empty into drains .
S33:Take precautionary measures against static discharges .
S61:Avoid release to the environment. Refer to special instructions safety data sheet . | [RIDADR ]
UN 1146 3/PG 2
| [WGK Germany ]
1
| [RTECS ]
GY2390000
| [Autoignition Temperature]
682 °F | [TSCA ]
Yes | [HazardClass ]
3 | [PackingGroup ]
II | [HS Code ]
29021990 | [Safety Profile]
Mildly toxic by
ingestion and inhalation. High
concentrations have narcotic action. A very
dangerous fire hazard when exposed to heat
or flame; can react with oxidizers. To fight
fire, use foam, CO2, dry chemical. When
heated to decomposition it emits acrid
smoke and fumes. | [Hazardous Substances Data]
287-92-3(Hazardous Substances Data) | [Toxicity]
LC (2 hr in air) in mice: 110 mg/l (Lazarew) |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Pentane-->1,3-Cyclopentadiene-->Cyclopentanone-->2-Methylbutane-->4,7-Methano-1H-indene, 3a,4,5,6,7,7a-hexahydro-, (3aR,4S,7R,7aR)-rel--->trans-1,2-Cyclopentanediol-->Cyclopentanemethanol-->BICYCLOPENTYL-->CYCLOPENTYLMAGNESIUM BROMIDE-->CIS-1,2-CYCLOPENTANEDIOL-->Methylcyclopentane-->Phenol-->Cyclopentene | [Preparation Products]
1,3-Cyclopentadiene-->Molinate-->Bromocyclopentane-->(1R，3S)-1，2，2-trimethyl-1，3-cycloperltanediamine-->IODOCYCLOPENTANE-->2-cyclopentyl-4,4,5,5-tetraMethyl-1,3,2-dioxaborolane-->1-Pentene |
| Hazard Information | Back Directory | [General Description]
A clear colorless liquid with a petroleum-like odor. Flash point of-35°F. Less dense than water and insoluble in water. Vapors are heavier than air. | [Reactivity Profile]
CYCLOPENTANE(287-92-3) is incompatible with strong oxidizing agents such as chlorine, bromine, fluorine. . | [Air & Water Reactions]
Highly flammable. Insoluble in water. | [Health Hazard]
Inhalation causes dizziness, nausea, and vomiting; concentrated vapor may cause unconsciousness and collapse. Vapor causes slight smarting of eyes. Contact with liquid causes irritation of eyes and may irritate skin if allowed to remain. Ingestion causes irritation of stomach. Aspiration produces severe lung irritation and rapidly developing pulmonary edema; central nervous system excitement followed by depression. | [Potential Exposure]
Cyclopentane is used as a solvent. | [Fire Hazard]
Behavior in Fire: Containers may explode. | [First aid]
If this chemical gets into the eyes, remove any
contact lenses at once and irrigate immediately for at least
15 minutes, occasionally lifting upper and lower lids. Seek
medical attention immediately. If this chemical contacts the
skin, remove contaminated clothing and wash immediately
with soap and water. Seek medical attention immediately.
If this chemical has been inhaled, remove from exposure,
begin rescue breathing (using universal precautions, includ-
ing resuscitation mask) if breathing has stopped and CPR if
heart action has stopped. Transfer promptly to a medical
facility. When this chemical has been swallowed, get medi-
cal attention. Do not induce vomiting, guard against aspira-
tion. Medical observation is recommended for 24 to
48 hours after breathing overexposure, as pulmonary edema
may be delayed. As first aid for pulmonary edema, a doctor
or authorized paramedic may consider administering a drug
or other inhalation therapy. | [Shipping]
UN1146 Cyclopentane, Hazard Class: 3; Labels:
3-Flammable liquid. | [Incompatibilities]
May form explosive mixture with air.
May accumulate static electrical charges, and may cause
ignition of its vapors. Contact with strong oxidizers may
cause fire and explosion. | [Description]
Cyclopentane is a colorless liquid. Molecularweight=70.15; Specific gravity=(H2O:1)=0.75; Boilingpoint=49℃; Freezing/Melting point=2 93.6℃; Vaporpressure=400 mmHg at 31℃; Relative vapor density (air-5 1)=2.42: Flash point=37.2℃; Autoignitiontemperature=361℃. Explosive limits in air: LEL=1.1%;UEL=8.7%. Hazard Identification (based on NFPA-704 MRating System): Health 1, Flammability 3, Reactivity 0.Insoluble in water | [Waste Disposal]
Dissolve or mix the material
with a combustible solvent and burn in a chemical incinera-
tor equipped with an afterburner and scrubber. All federal,
state, and local environmental regulations must be
observed. | [Physical properties]
Colorless, mobile, flammable liquid with an odor resembling cyclohexane. | [Definition]
ChEBI: A cycloalkane that consists of five carbons each bonded with two hydrogens above and below the plane. The parent of the class of cyclopentanes. | [Production Methods]
Cyclopentane occurs in petroleum ether fractions and is
prepared by cracking cyclohexane in the presence of alumina
at high temperature and pressure or by reduction of cyclopentadiene. | [Flammability and Explosibility]
Highlyflammable | [Chemical Reactivity]
Reactivity with Water No reaction; Reactivity with Common Materials: No reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent. | [Source]
Component of high octane gasoline (quoted, Verschueren, 1983). Harley et al. (2000)
analyzed the headspace vapors of three grades of unleaded gasoline where ethanol was added to replace methyl tert-butyl ether. Cyclopentane was detected at an identical concentration of 1.4 wt
% in the headspace vapors for regular, mid-, and premium grades.
Schauer et al. (1999) reported cyclopentane in a diesel-powered medium-duty truck exhaust at
an emission rate of 410 μg/km.
California Phase II reformulated gasoline contained cyclopentane at a concentration of 4.11
g/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without
catalytic converters were 0.78 and 85.4 mg/km, respectively (Schauer et al., 2002). | [Environmental Fate]
Biological. Cyclopentane 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 octane and OH
radicals in the atmosphere: 3.7 x 10-12 cm3/molecule?sec at 300 K (Hendry and Kenley, 1979); 5.40
x 10-12 cm3/molecule?sec (Atkinson, 1979); 4.83 x 10-12 cm3/molecule?sec at 298 K (DeMore and
Bayes, 1999); 6.20 x 10-12, 5.24 x 10-12, and 4.43 x 10-12 cm3/molecule?sec at 298, 299, and 300 K,
respectively (Atkinson, 1985), 5.16 x 10-12 cm3/molecule?sec at 298 K (Atkinson, 1990), and 5.02
x 10-12 cm3/mol·sec at 295 K (Droege and Tilly, 1987).
Chemical/Physical. Cyclopentane will not hydrolyze because it has no hydrolyzable functional
group. Complete combustion in air yields carbon dioxide and water.
At elevated temperatures, rupture of the ring occurs forming ethylene and presumably allene
and hydrogen (Rice and Murphy, 1942). | [storage]
Color Code—Red: Flammability Hazard: Store ina flammable liquid storage area or approved cabinet awayfrom ignition sources and corrosive and reactive materials.Prior to working with cyclopentane you should be trainedon its proper handling and storage. Before entering confinedspace where cyclopentane may be present, check to makesure that an explosive concentration does not exist. Store intightly closed containers in a cool well-ventilated area awayfrom strong oxidizers (such as chlorine, bromine, and fluorine). Use only nonsparking tools and equipment, especiallywhen opening and closing containers of cyclopentane.Metal containers involving the transfer of this chemicalshould be grounded and bonded. Where possible, automatically pump liquid from drums or other storage containers toprocess containers. Drums must be equipped with selfclosing valves, pressure vacuum bungs, and flame arresters.Use only nonsparking tools and equipment, especially whenopening and closing containers of this chemical. Sources ofignition, such as smoking and open flames, are prohibitedwhere this chemical is used, handled, or stored in a mannerthat could create a potential fire or explosion hazard.Wherever this chemical is used, handled, manufactured, orstored, use explosion-proof electrical equipment andfittings. | [Purification Methods]
Free it from cyclopentene by two passages through a column of carefully dried and degassed activated silica gel. It occurs in petroleum and is HIGHLY FLAMMABLE. [NMR: Christl Chem Ber 108 2781 1975, Whitesides et al. 41 2882 1976, Beilstein 5 III 10, 5 IV 4.] |
| Questions And Answer | Back Directory | [Physical and chemical properties]
Cyclopentane, also known as "pentamethylene", is a kind of cycloalkane with the formula of C5H10. It has a molecular weight of 70.13. It exists as a kind of flammable liquid. It has a melting point-94.4 °C, boiling point of 49.3 °C, relative density of 0.7460 and the refractive index of 1.4068. It is soluble in alcohol, ether and hydrocarbons and is not soluble in water. Cyclopentane is not a planar ring and has two conformations: envelope conformations and semi-chair conformations. The carbon-carbon-carbon bond angle is close to 109 ° 28 ' with the molecular tension not big and the ring being relatively stable. It has a similar chemical property as alkanes. The lethal concentration in the air for the rats was 3.8 × 10-2. It exhibits red yellow color when having reaction with fuming sulfuric acid while generating nitro cyclopentane and glutaric acid through reaction with nitric acid. Method: it can be obtained from the petroleum ether distillate, through high-pressure cracking on the cyclohexane in the presence of aluminum or catalytic hydrogenation of cyclopentene and cyclopentadiene. Purposes: mainly used as a solvent.
Figure 1 the cyclopentane structure. | [Cycloalkane]
Cycloalkanes are saturated hydrocarbons in which the carbon atoms in the molecule are arranged in a ring and a sufficient number of hydrogen atoms are combined. Cycloalkanes presented in petroleum are mainly cyclopentane and cyclohexane.
Cycloalkanes have a higher melting point, boiling point, and relative density than the corresponding straight-chain alkanes. We can use the naphthenic aromatic crude oil to produce high-octane straight-run gasoline with its anti-explosion being better than normal paraffin. Low sulfur-containing paraffin naphthenic crude oil, is not only easy to process, but also an excellent raw material for the production of advanced lubricants. Petroleum containing relative many polycyclic long side chain naphthenic compounds is an ideal material for high-quality lubricants.
At room temperature and atmospheric pressure, cycloalkane containing four or less carbon atoms is in the gas form with those contain more than four carbons existing in the liquid form. The cyclopropane and cyclobutane appear as gas, cyclopentane to cycloundecane appears as liquid; cyclododecane and above appears as solid.
The chemical nature of the cycloalkane is related to the number of carbon atoms forming the ring. It is referred three-membered ring and four-membered ring, as small ring; the five-to-seven-membered ring as normal ring; the eight-eleven ring as normal ring; the twelve-membered ring and above as large ring. The nuclei lines of carbon nuclei in small rings are not consistent with the axis of bonding orbital. In cyclopropane, the ring formed by the nucleus lines of carbon atoms is an equilateral triangle with each angle being 60° while the angle of the sp3 hybrid orbital axis of carbon-carbon single bonds formed by each carbon 104° (see figure 2 below). Therefore, the orbit has failed to achieve the greatest degree of overlap, causing a large angle tension. Cyclobutane also has angular tension, but being smaller. This leads to the poor stability of the small ring, causing its similar chemical property to olefins that can have ring-opening addition reaction with many reagents. Other ring has less of no angular tension. Cycloalkane and alkanes have similar chemical properties, less prone to have ring-opening reaction such as having reaction with hydrogen. Cyclohexane and higher cycloalkane is more difficult to undergo hydrogenation.
Figure 2 is a schematic representation of sp3 hybridization orbital overlap in cyclopropane.
Cyclopropane (at room temperature) and cyclobutane (at the heating conditions) can have addition reaction with halogen and hydrogen halide.
The open-loop occurs between the two atoms connecting the most and least numbers of hydrogen. The addition satisfies the Markovian rule. While the normal ring, under the stimulation of the light or heat can have substitution reaction with the halogen.
At room temperature, cycloalkane can’t be oxidized by potassium permanganate.
Cyclopentane, cyclohexane and its alkyl substituted products are presented in certain petroleum oils. Cycloalkanes may also be synthesized by suitable methods, such as dihaloalkane cyclization and hydrogenation of aromatic hydrocarbons.
This information was edited by Xiaonan from Chemicalbook (2015-08-17). | [Dangerous situation]
Ingestion and inhalation are moderately toxic. (2) Being flammable with greater risk of combustion. The allowable concentration in air is 600ppm (1720mg/m3) in the United States. | [Harmful effects and symptoms of poisoning]
Inhalation of high concentrations of cyclopentane can cause central nervous system inhibition, although its acute toxicity is low. Symptoms of acute exposure include excitement at first, followed by the emergence of balance disorders, and even stupor, coma. There are rarely cases of death due to respiratory failure. It has been reported that animals fed with this goods can get severe diarrhea, leading to heart, lung and liver vascular collapse and brain degeneration. | [Protective measures]
It can be used for improving the production equipment. Use skin protective creams or gloves to protect the skin. | [Medical care]
Upon regular physical examination, pay attention to the potential irritation effect of skin and respiratory tract as well as any complications of kidney and liver. | [Transportation requirements]
Grade I flammable liquid. Code of Hazard Regulations: 61013. The container shall be marked with a "flammable liquid" mark on transport. | [Fire extinguishing agent]
See “cyclohexane”. | [Recommended waste disposal methods]
Incineration; | [Chemical properties]
It appears as colorless liquid with a melting point of-93.9 °C, the boiling point of 49.26 ° C, the relative density of 0.7460 (20/4 ° C), the refractive index of 1.4068 and the flash point of-37 °C. It is miscible with alcohol, ether and other organic solvents, being not be easy to be dissolved in water. | [Uses]
(1) It can be used as a solvent for solution polymerization of polyisoprene rubber and cellulose ether. It can be used as a substitute for Freon as insulation materials in refrigerators and freezers as well as foaming agents for other hard PU foams, and chromatographic analysis standards.
(2) Used as a standard substance for chromatographic analysis, solvents, engine fuels, azeotropic distillation agents. | [Production method]
Cyclopentane is a component of the petroleum ether in the 30-60 °C boiling point range with the content being generally 5%-10%. Apply atmospheric distillation; at a 60: 1 reflux ratio and carry out at an 8m height tower; first distill out the isopentane and n-pentane; continue fractionation to obtain a cyclopentane with purity being over 98%. Cyclopentane can also be obtained through cyclopentanone reduction or cyclopentadiene catalytic hydrogenation. | [Hazards & Safety Information]
Category Flammable liquids
Toxicity grading: Low toxicity
Acute toxicity: oral-rat LD50: 11400 mg/kg; oral-mouse LD50: 12800 mg/kg
Hazardous property of explosives: being explosive upon mixed with air
Flammability and dangerous situations: being flammable in case of fire, high temperature and oxidant with combustion releasing irritant smoke
Storage characteristics: Storehouse: ventilated, low temperature and dry; Store it with oxidant separately
Extinguishing agent: Dry powder, carbon dioxide, foam, 1211 extinguishing agent
Occupational standard: TWA 1720 mg/m3; STEL 2150 mg/kg |
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