Direct irradiation of 2-methyl-2-(cyclopent-1-enyl)cyclopentanone (1) gives the hydroazulene (2), whereas the tricyclic ketone (4) is produced upon sensitized irradiation in acetone.
R. G. Carlson, R. L. Coffin, W. W. Cox and R. S. Givens, J. Chem. Soc., Chem. Commun., 1973, 501 DOI: 10.1039/C39730000501
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