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The vapor phase photolysis of cyclopentanone, cyclopentanone-d8, and cyclobutanone have been investigated at 3 130 Å and 2 537 Å under a variety of conditions. In cyclopentanone photolysis a pressure- and wavelength-dependent "falloff" has been observed in the product ratio cyclobutane:ethylene, while a similarly dependent effect in the ratio cyclopropane: propylene exists in cyclobutanone photolysis. In the light of this data a reappraisal has been made of existing concepts regarding the photodecomposition of these ketones.
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Klemm et al. (1965) studied this question.
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