Reference

Mechanisms of photochemical reactions in urban air

Mechanisms of photochemical reactions in urban air. Volume I. Chemistry studies. Pitts, James N., Jr. (Statewide Air Pollut. Res. Cent., Univ. California, Riverside, Calif., USA). U. S. NTIS, PB Rep., PB-265592, 184 pp. Avail. NTIS From: Gov. Rep. Announce. Index (U. S.) 1977, 77(13), 124 (English) 1977. CODEN: XPBRCA. DOCUMENT TYPE: Report CA Section: 59 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 74 Results are presented of the kinetics, mechanisms, and products of reactions involved in photochem. air pollution. Rate consts. were detd. by using competitive and modulation-phase shift techniques, for the gas phase reaction of O 3P atoms with a variety of org. and inorg. species over the temp. range 296-423K. Products for the gas phase reaction of O 3P atoms with toluene [108-88-3] and 1-methylcyclohexene [591-49-1] were also studied. The products and mechanisms of the reaction of NO with methyl peroxy radicals were investigated at 296K using long-path IR spectroscopic and gas chromatog. techniques. The reactions of peroxyacetyl nitrate [2278-22-0] were investigated in the gas phase with selected constituents of polluted atms., and in the liq. phase with a variety of orgs. Chemiluminescence from the reaction of peroxyacetyl nitrate with a series of amines was studied in the liq. phase. The mechanism and products of the gas phase reactions of O3 with a variety of orgs. was investigated in low-pressure flow systems using chemiluminescent and photoionization mass spectrometric techniques. The NO2-catalyzed geometric isomerization of 2-butene [107-01-7] and pentene [11104-93-1] was studied over the temp. range 298-400K while an investigation of the NOx-propylene [115-07-1] photooxidn. system was carried out at room temp.

Relative rate constants for the reaction of hydroxyl radicals with selected C6 and C7 alkanes and alkenes at 305

Relative rate constants for the reaction of hydroxyl radicals with selected C6 and C7 alkanes and alkenes at 305 .+-. 2 K. Darnall, Karen R.; Winer, Arthur M.; Lloyd, Alan C.; Pitts, James N., Jr. (Statewide Air Pollut. Res. Cent., Univ. California, Riverside, Calif., USA). Chem. Phys. Lett., 44(3), 415-18 (English) 1976.Some commonly used reagents like 591-49-1 and 79-29-8 are used in this experiment. CODEN: CHPLBC. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Measurements of the rates of disappearance of 3 alkenes and 2 alkanes relative to isobutene in environmental chamber photooxidn. studies employing hydrocarbon-NOx mixts. in air at 1 atm were used to obtain relative rate consts. for the reaction of these compds. with the hydroxyl radical. Abs. rate consts. at 305 .+-. 2 K obtained using a published rate const. for OH + isobutene of 3.05 .times. 1010 L mol-1 s-1 are (k .times. 10-9 L mol-1 s-1): cyclohexene, 47 .+-. 9; 1-methylcyclohexene, 58 .+-. 12; 1-heptene, 22 .+-. 5; 2,3-dimethylbutane, 3.1 .+-. 0.5; 2,2,3-trimethylbutane, 2.3 .+-. 0.5. No previous detns. of OH rate consts. have been reported for 1-heptene and 1-methylcyclohexene. For the remaining compds., these results are in good agreement with literature values reported for elementary or relative rate const. detns. .