Cohalogenation by N-bromosuccinimide in methanol of β-bromoallenyl ethers (3a–g) or allyl allenyl ethers (8d–f) affords unsaturated halogeno-compounds (5a–g) or (9d–f) which are converted via homolytic carbocyclization into α-methylene-γ-butyrolactones (7a–g).
J. P. Dulcere, M. N. Mihoubi and J. Rodriguez, J. Chem. Soc., Chem. Commun., 1988, 237 DOI: 10.1039/C39880000237
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