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Alkenyl-substituted ketals 6 readily afford Claisen rearrangement substrates 7 upon treatment with TESOTf/DIPEA. Thermal rearrangement completes this efficient and general process for generation of functionally rich ϵ-oxy-γ,δ-enones 8.
Daub and coworkers have investigated the regio- and stereoselectivity of
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