ABSTRACT
H3C CH3 CASRN: 646-04-8; molecular formula: C5H10; FW: 70.13; Merck Index: 12, 7263 Physical state, color, and odor: Clear, colorless, very flammable liquid with a disagreeable odor. Melting point (°C): -136 (Weast, 1986) Boiling point (°C): 36.35 (Scott and Waddington, 1950) Density (g/cm3): 0.6482 at 20 °C (Weast, 1986) 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): <-20 (NFPA, 1984) Entropy of fusion (cal/mol⋅K): 15.02 (Chao et al., 1983) 15.01 (Todd et al., 1947) Heat of fusion (kcal/mol): 1.996 (Chao et al., 1983; Todd et al., 1947) Henry’s law constant (atm⋅m3/mol): 0.234 at 25 °C (Hine and Mookerjee, 1975) Ionization potential (eV): 9.06 (Collin and Lossing, 1959) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aliphatic hydrocarbons are lacking in the documented literature Octanol/water partition coefficient, log Kow: 2.15 using method of Hansch et al. (1968) Solubility in organics: Soluble in alcohol, benzene, and ether (Weast, 1986)
203 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): 505.5 at 25 °C (Wilhoit and Zwolinski, 1971) 289.152 at 10.922 °C, 355.221 at 15.927 °C, 433.49 at 20.969 °C, 525.78 at 26.055 °C, 633.93 at
31.183 °C (ebulliometry, Scott and Waddington, 1950) Environmental fate: Chemical/Physical. Complete combustion in air yields carbon dioxide and water. Source: Schauer et al. (1999) reported trans-2-pentene in a diesel-powered medium-duty truck exhaust at an emission rate of 50 µg/km. 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 trans-2-pentene was 16.0 mg/kg of pine burned. Emission rates of trans-2-pentene were not measured during the combustion of oak and eucalyptus. California Phase II reformulated gasoline contained trans-2-pentene at a concentration of 4.12 g/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 0.71 and 77.4 mg/km, respectively (Schauer et al., 2002). Uses: Polymerization inhibitor; organic synthesis.
