Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Cadmium-photosensitized Decomposition of Acetaldehyde, Propionaldehyde, and n-Butyraldehyde
Koji YamamotoShigeru TsunashimaShin Sato
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1973 Volume 46 Issue 12 Pages 3677-3681


The reactions of acetaldehyde, propionaldehyde, and n-butyraldehyde photosensitized by cadmium (3P1) have been investigated at 270 °C. The pressure dependence of the main products, CO, RH (R=CH3, C2H5, and n-C3H7) and R2, was well explained by the following reaction mechanism; Cd*+RCHO→R+CHO+Cd or RH+CO+Cd. R+RCHO→RH+RCO, RCO→R+CO, CHO→H+CO, H+RCHO→H2+RCO, R+R→R2 or RH+ Olefin. Carbon dioxide was found to be a rather good quencher for triplet cadmium atoms, and was used for estimating the relative quenching efficiencies of the three aldehydes and acetone. The values obtained were 0.16, 1.0, 1.3, 1.2, and 1.4, respectively for carbon dioxide, acetone, acetaldehyde, propionaldehyde, and n-butyraldehyde, when the efficiency of cis-2-butene was assumed to be unity.

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