The Thermal Decomposition of Acetaldehyde in the Presence of Methanethiol
スポンサーリンク
概要
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Acetaldehyde has been decomposed thermally in the presence of methanethiol over the temperature range from 400° to 440°C. The presence of methanethiol markedly enhances the rate of decomposition. Analysis of the initial rates of decomposition obtained under various experimental conditions suggests: a) one of the chain-carrying steps CH<SUB>3</SUB>+CH<SUB>3</SUB>CHO=CH<SUB>4</SUB>+CH<SUB>3</SUB>CO (5) in the decomposition of acetaldehyde alone is replaced by CH<SUB>3</SUB>+CH<SUB>3</SUB>SH=CH<SUB>4</SUB>+CH<SUB>3</SUB>S (10) and CH<SUB>3</SUB>S+CH<SUB>3</SUB>CHO=CH<SUB>3</SUB>SH+CH<SUB>3</SUB>CO (11) in the presence of methanethiol; b) the reaction CH<SUB>3</SUB>SH=CH<SUB>3</SUB>+SH (7), in addition to CH<SUB>3</SUB>CHO=CH<SUB>3</SUB>+CHO (1), contributes to the chain initiation; c) the chain terminates by the combination of methylthio radicals in contrast to the decomposition in the presence of hydrogen sulfide where the chain-ending step is the combination of methyl radicals under similar experimental conditions; d) <I>k</I><SUB>5</SUB>⁄<I>k</I><SUB>11</SUB>=0.8exp(－2,800⁄<B>RT</B>) and <I>k</I><SUB>1</SUB>⁄<I>k</I><SUB>7</SUB>=130exp(－11,000⁄<B>RT</B>), the latter expression being less certain.
- 社団法人 日本化学会の論文
著者
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Toyama Osamu
Department Of Animal Physiology Meiji University
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IMAI N.
Department of Neurology, Kitasato University
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Toyama Osamu
Department of Applied Chemistry College of Engineering University of Osaka Prefecture
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Imai Naomi
Department of Applied Chemistry College of Engineering University of Osaka Prefecture
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