
Journal of the Chemical Society. Perkin transactions II p. 724 - 730 (1980)
Update date:2022-08-28
Topics:
Scaiano, Juan C.
Encinas, M. Victoria
George, Manapurathu V.
Williams, D. Lyn H.
U.v.-irradiation of o-phthalaldehyde leads to the formation of phthalide and dimeric products in varying yields and ratios depending on the solvent and reagent concentration.Laser flash photolysis studies show that the photochemistry of o-phthalaldehyde involves the intermediacy of a 1,4-biradical produced by intramolecular hydrogen transfer, and with a lifetime of 1.6 μs.Two triplet states are the precursors of the biradical; they have lifetimes of 6 and 36 ns and are assigned to different rotational conformers.The triplet reaction path is not responsible for product formation; these arise via a parallel reaction path, apparently involving the singlet state.
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