Journal
TETRAHEDRON LETTERS
Volume 42, Issue 41, Pages 7265-7268Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(01)01531-3
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Dibromoolefination of lactones was achieved in high yields using bromomethylenetriphenylphosphorane in refluxing tetrahydrofuran. This reaction is believed to proceed via bromination of the monobromophosphorane from the corresponding bromomethyltriphenylphosphonium bromide with concomitant formation of methylenetriphenylphosphorane as shown by P-31 NMR. Transylidation should Occur to afford the reactive dibromomethylenetriphenylphosphorane. (C) 2001 Elsevier Science Ltd. All rights reserved.
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