Tetrahedron Letters p. 5517 - 5520 (1990)
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Treatment of monoalkylsubstituted allenic esters 4 with NBS and water in the darkness yields β-bromo-α,β-butenolides 5, that are easily transformed into 5-alkyl-4-bromo-5-hydroxy-2(5H)-furanones 8 and 5-alkylidene-4-bromo-2-(5H)-furanones 2.
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