Tosylhydrazones 4a–d of vinylogous lactones 1a–d on treatment with N-bromosuccinimide, under strictly controlled conditions, give the title acetylenic compounds 5a–d in 65–90% yield.
J. R. Mahajan and I. S. Resck, J. Chem. Soc., Chem. Commun., 1993, 1748 DOI: 10.1039/C39930001748
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