Cyclopentane
Title: Cyclopentane
CAS Registry Number: 287-92-3
Additional Names: Pentamethylene
Molecular Formula: C5H10
Molecular Weight: 70.13
Percent Composition: C 85.63%, H 14.37%
Literature References: Occurs in petroleum. Found in petr ether fractions. Prepd by cracking cyclohexane in the presence of alumina at high temps and pressure: Haensel, Ipatieff, Ind. Eng. Chem. 35, 632 (1943); by reduction of cyclopentadiene: David et al., Bull. Soc. Chim. Fr. [5] 11, 561 (1944). Toxicity data: Lazarew, Arch. Exp. Pathol. Pharmakol. 149, 116 (1930).
Properties: Mobile, flammable liq. mp -94.4°. bp 49.3°. d420 0.7460. nD20 1.4068. Insol in water. Miscible with other hydrocarbon solvents, alcohol, ether. LC (2 hr in air) in mice: 110 mg/l (Lazarew).
Melting point: mp -94.4°
Boiling point: bp 49.3°
Index of refraction: nD20 1.4068
Density: d420 0.7460
Toxicity data: LC (2 hr in air) in mice: 110 mg/l (Lazarew)
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, nose and throat; lightheadedness, dizziness, euphoria, incoordination, nausea, vomiting, stupor; dry, cracking skin. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 86.

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