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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