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Molecules 2001, 6(4), 287-299; doi:10.3390/60400287
Article

Photooxidation of n-Hexanal in Air

1,* , 2 and 3
Received: 21 November 2000 / Revised: 11 December 2000 / Accepted: 12 December 2000 / Published: 31 March 2001
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Abstract

Dilute mixtures of hexanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) in air at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were butene, CO, vinylalcohol and ethanal. The photolysis rates and the absolute quantum yield Φ were found to be slightly dependent on the total pressure. At 100 Torr, Φ100 = 0.43 ± 0.02, whereas at 700 Torr the total quantum yield was Φ700 = 0.38 ± 0.02. These results may be explained by the collisional deactivations of photoexcited molecules. Two decomposition channels were identified: the radical channel C5H11CHO → C5H11 + HCO, and the molecular channel C5H11CHO → C4H8 + CH2=CHOH, having the relative yields of 27 and 73 % at 700 Torr. The product CH2=CHOH tautomerizes to ethanal.
Keywords: Photolysis; photooxidation; aldehydes Photolysis; photooxidation; aldehydes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tadić, J.; Juranić, I.; Moortgat, G.K. Photooxidation of n-Hexanal in Air. Molecules 2001, 6, 287-299.

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