Abstract
The direct photolysis of cyclopentyl-type nitrites allows to detection, by EPR spectroscopy, the corresponding δ-valerolactam-1-oxyl type radical, owing to a ring expansion process as reported for steroidal 17-nitrites. For the formation of these radicals a 1,6 exo ring closure process of the intermediate 5-nitrosopentanoyl-type radical is involved.
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