ABSTRACT
H2C CH3 CASRN: 109-67-1; DOT: 1108; DOT label: Combustible liquid; molecular formula: C5H10; FW: 70.13; Merck Index: 12, 7262 Physical state, color, and odor: Clear, colorless, volatile, very flammable liquid with a disagreeable odor. An odor threshold concentration of 10 ppbv was determined by a triangular odor bag method (Nagata and Takeuchi, 1990). Melting point (°C): -165.219 (Dreisbach, 1959) Boiling point (°C): 30 (Weast, 1986) Density (g/cm3): 0.64050 at 20 °C, 0.63533 at 25 °C (Dreisbach, 1959) Diffusivity in water (x 10-5 cm2/sec): 0.84 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: >14 (Schwarzenbach et al., 1993) Flash point (°C): -17.7 (open cup, NFPA, 1984) Lower explosive limit (%): 1.5 (Sax and Lewis, 1987) Upper explosive limit (%): 8.7 (Sax and Lewis, 1987) Entropy of fusion (cal/mol⋅K): 12.86 (Chao et al., 1983; Todd et al., 1947) 13.14 (Messerly et al., 1990) Heat of fusion (kcal/mol): 1.388 (Chao et al., 1983; Todd et al., 1947) 1.419 (Messerly et al., 1990) Henry’s law constant (atm⋅m3/mol): 0.406 at 25 °C (Hine and Mookerjee, 1975) Ionization potential (eV): 9.49 (Lias, 1998) 9.67 (Collin and Lossing, 1959)
oc Unavailable because experimental methods for estimation of this parameter for aliphatic hydrocarbons are lacking in the documented literature Octanol/water partition coefficient, log Kow: 2.26 using method of Hansch et al. (1968) Solubility in organics: Miscible with alcohol, benzene, and ether (Windholz et al., 1983) Solubility in water: 148 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966) Vapor density: 2.87 g/L at 25 °C, 2.42 (air = 1) Vapor pressure (mmHg): 241.3 at °C, 297.1 at 5 °C, 363.1 at 10 °C, 531.3 at 20 °C, 760 at 30.07 °C, 1,069 at 40 °C (Day et
al., 1948) 628.2 at 24.6 °C (Forziati, 1950) 637.7 at 25 °C (Wilhoit and Zwolinski, 1971) Environmental fate: Biological. Biooxidation of 1-pentene may occur yielding 4-penten-1-ol, which may oxidize to give 4-pentenoic acid (Dugan, 1972). Washed cell suspensions of bacteria belonging to the genera Mycobacterium, Nocardia, Xanthobacter, and Pseudomonas and growing on selected alkenes metabolized 1-pentene to 1,2-epoxypentane. Mycobacterium sp., growing on ethene, hydrolyzed 1,2-epoxypropane to 1,2-propanediol (Van Ginkel et al., 1987). Photolytic. The following rate constants were reported for the reaction of 1-pentene and OH radicals in the atmosphere: 1.8 x 10-13 cm3/molecule⋅sec at 300 K (Hendry and Kenley, 1979); 3.14 x 10-11 cm3/molecule⋅sec (Atkinson, 1990). Atkinson (1990) also reported a photooxidation rate constant of 1.10 x 10-17 cm3/molecule⋅sec for the reaction of 1-pentene and ozone. Chemical/Physical. Complete combustion in air yields carbon dioxide and water. 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 1-pentene was 8.6 mg/kg of pine burned. Emission rates of 1-pentene were not measured during the combustion of oak and eucalyptus. California Phase II reformulated gasoline contained 1-pentene at a concentration of 1.48 g/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 0.40 and 51.8 mg/km, respectively (Schauer et al., 2002). Uses: Blending agent for high octane motor fuel; organic synthesis.
