Photochemische Reaktionen. 103. Mitteilung [1]. Zur Photochemie konjugierter Epoxy-en-carbonylverbindungen der Jonon-Reihe: UV.-Bestrahlung α,β-ungesättigter ε-Oxo-γ, δ-epoxy-carbonylverbindungen und Untersuchung des Mechanismus der Epoxy-enon/Furan-Isome
作者:Bruno Frei、Guy de Weck、Klaus Müllen、Hans Richard Wolf、Oskar Jeger
DOI:10.1002/hlca.19790620224
日期:1979.3.7
The Photochemistry of Conjugated γ,δ-Epoxy-ene-carbonyl Compounds of the Ionone Series: UV.-Irradiation of α,β-Unsaturated ε-Oxo-γ,δ-epoxy Compounds and Investigation of the Mechanism of the Isomerization of Epoxy-enones to Furanes
Competitive Formation of Ylide and Carbene Intermediates from1?,?*-Excited ?,?-Unsaturated ?,?-Epoxyketones
作者:Norbert Bischofberger、Bruno Frei、Jakob Wirz
DOI:10.1002/hlca.19830660814
日期:1983.12.14
Laser flash photolyses (λ = 265mm) of the γ,λ-epoxyenones 1–3, 7 and 8, the α,β-unsaturated γ,δ-epoxy ester 6, and the epoxytriene 9 at ambient temperature produced short-lived transients with broad absorption maxima in the visible region, which are identified as carbonyl ylides. Comparison of the rather long-wavelength absorption maxima with the results of standard PPP SCF SCI calculations suggests