Reaction of 1,1-dibromoalk-1-enes with samarium diiodide in benzene containing 10% of hexamethylphosphoric triamide (HMPA) affords rearranged alkynes; generation of alkylidenecarbenes is probably involved.
M. Kunishima, K. Hioki, T. Ohara and S. Tani, J. Chem. Soc., Chem. Commun., 1992, 219 DOI: 10.1039/C39920000219
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