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- W2949594415 abstract "α-Alkylidene-γ-butyrolactones are readily prepared by the palladium-catalyzed heteroannulation of a variety of 1,3-dienes by α-iodo and α-bromo acrylic acids. The best results are obtained by employing a catalytic amount of the sterically hindered chelating alkyl phosphine D-t-BPF [(di-tert-butylphosphino)ferrocene]. In most cases, this process is highly regioselective. The reaction is believed to proceed via (1) oxidative addition of the vinylic halide to Pd(0), (2) organopalladium addition to the less hindered end of the 1,3-diene to form a π-allylpalladium intermediate, and (3) nucleophilic displacement of the palladium by the carboxylate ion." @default.
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- W2949594415 date "2000-02-05" @default.
- W2949594415 modified "2023-10-16" @default.
- W2949594415 title "Palladium-Catalyzed Heteroannulation of 1,3-Dienes To Form α-Alkylidene-γ-butyrolactones" @default.
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- W2949594415 doi "https://doi.org/10.1021/jo991692g" @default.
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