Irradiation of o-vinylbenzaldehyde 1a affords the oxygen-bridged dimer 7a, presumably, through an initial [π2a+π4s] rearrangement; intermediacy of spiro triene 6 is supported by deuterium labelling experiments which also reveal the reversible nature of the concurrently occurring 1,5-hydrogen shift (1 ⇄ 2).
S. V. Kessar and A. K. S. Mankotia, J. Chem. Soc., Chem. Commun., 1993, 1828 DOI: 10.1039/C39930001828
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