Atmospheric Chemistry of Unsaturated Carbonyls: Butenedial, 4-Oxo-2-pentenal, 3-Hexene-2,5-dione, Maleic Anhydride, 3H-Furan-2-one, and 5-Methyl-3H-furan-2-one.

As part of a study on the oxidation mechanisms of aromatics some aspects of the atmospheric chemistry of several possible product, unsaturated 1,4-dicarbonyl compounds and two furanones, have been investigated in a 1080-L reaction chamber by 296±2 K in 1000 mbar of synthetic air. Rate coefficients for the reaction of OH radicals with the following compounds have been obtained using the relative method (in units of 10 -12 cm 3 molecule -1 s -1 ): cis-butenedial (maleic dialdehyde), 52.1±1.0; trans-butenedial (fumaric dialdehyde), ≥24.1±7,9; cis/trans-4-oxo-2-pentenal (acetylacrolein), 55.8±2.1; cis-3-hexene-2,5-dione, 69.0±21.0; trans-3-hexene-2,5-dione, 40.0± 4.0; maleic anhydride, 1.45±0.1; 3H-furan-2-one, 44.5± 2.6; 5-methyl-3H-furan-2-one (α-angelica lactone), 69.0±4.6