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Laser photolysis of 2-propanone, 2-butanone, 3-pentanone and 3-buten-2-one in the gas phase

✍ Scribed by Josef Pola; Yoshinori Koga; Akihiko Ouchi

Publisher: Elsevier Science
Year: 1997
Tongue: French
Weight: 508 KB
Volume: 53
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(97)00096-3

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✦ Synopsis

Low fluence (25 mJ.cm °2) and high fluence (180 mJ.cm -2) ArF laser (193.3 nm) photolysis of R1C(O)R 2, (R 1, R 2 = CH3, C2H5, C2H3) afford carbon monoxide and hydrocarbons vVnich are in the former case mostly R1-R 2 alkanes and in the latter case R1-R 2 alkanes along with methane, ethene and ethyne. The effect of excess of helium and hydrogen suggests that the products preferred at the high-fluence result from reactions of hot CH 3" radicals, and disproporUonations of C2H 5" and cross disproportionation of CH 3" radicals. No effect of radical scavenging [2H4]germane on the course of the Iow-fluence photolysis is judged to reflect high energy content of R 1 and R 2 radicals.

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