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Novel Oxa-di-π-methane and Norrish Type I Reactions in the S2 (π,π*) Excited State of a Series of β,γ-Unsaturated Ketones

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journal contribution
posted on 23.06.2005, 00:00 by Diego Armesto, Maria J. Ortiz, Antonia R. Agarrabeitia, Mar Martín-Fontecha
β,γ-Unsaturated methyl ketones with electron-withdrawing groups at the γ-position of the ene moiety undergo ODPM rearrangements and Norrish type I reactions on direct irradiation at 254 nm. The results are consistent with the involvement of alkene S2 (π,π*) as reactive excited states in these processes.