Abstract
A de Mayo type cyclobutane ring opening of the photo[2 + 2]cycloadduct derived from 2,3-dihydro-4-pyrones and cyclopentene was effected by heating the adduct under an acid catalysis. The 1,2-disubstituted cyclopentanes thus formed spontaneously underwent intramolecular Michael addition to afford cis-hydroindan-5-ones in satisfactory yields.
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