ABSTRACT
CASRN: 2040-96-2; molecular formula: C8H16; FW: 112.22; RTECS: GY4700000 Physical state, color, and odor: Clear, colorless, mobile, flammable liquid with an ether-like odor Melting point (°C): -117.3 (Weast, 1986) Boiling point (°C): 131 (Weast, 1986) Density (g/cm3): 0.77633 at 20 °C, 0.77229 at 25 °C (Dreisbach, 1959) Diffusivity in water (x 10-5 cm2/sec): 0.71 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: >14 (Schwarzenbach et al., 1993) Entropy of fusion (cal/mol⋅K): 15.40 (Messerly et al., 1965) Heat of fusion (kcal/mol): 2.398 (Messerly et al., 1965) Henry’s law constant (atm⋅m3/mol): 1.1 at 25 °C (Mackay and Shiu, 1981) Ionization potential (eV): 9.34 (Lias and Liebman, 1998) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for alicyclic hydrocarbons are lacking in the documented literature Octanol/water partition coefficient, log Kow: 3.63 using method of Hansch et al. (1968) Solubility in organics: Soluble in acetone, benzene, and ether (Weast, 1986); miscible with cyclopentane. Solubility in water (at 25 °C): 2.04 mg/kg (shake flask-GLC, Price, 1976) 1.77 mg/L (Kryzanowska and Szeliga, 1978)
4.59 g/L at 25 °C, 3.87 (air = 1) Vapor pressure (mmHg): 12.3 at 25 °C (Wilhoit and Zwolinski, 1971) Environmental fate: Chemical/Physical. Complete combustion in air produces carbon dioxide and water vapor. Propylcyclopentane will not hydrolyze because it does not contain a hydrolyzable functional group (Kollig, 1993). Toxicity: EC50 (48-h) for Daphnia pulex 3,113 µg/L (Smith et al., 1988). Uses: Organic synthesis; gasoline component.
