Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Photolysis of Cyclopentanone
Shigeru TsunashimaOsamu OhsawaChiharu TakahashiShin Sato
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1973 Volume 46 Issue 1 Pages 83-86


The 326.1 nm direct photolysis and the cadmium-photosensitized reactions of cyclopentanone have been compared in order to clarify the role of the triplet state of cyclopentanone in the photolysis. The products observed in the both photolyses were carbon monoxide, ethylene, cyclobutane, and 4-pentenal. The results obtained in the direct photolysis were very similar to those obtained in the cadmium photosensitization. The ethylene/cyclobutane ratio was not affected by the pressure and temperature changes. The 4-pentenal/CO ratio increased with a decrease in the temperature. These similarities suggest that the decomposition of cyclopentanone takes place through the lowest triplet state in both the photolyses. The efficiency of cyclopentanone in quenching triplet cadmium was found to be about 0.8 times that of cis-2-butene.

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