1,4-Elimination of hydrogen bromide from 1-bromoallenes in the presence of either dry cuprous cyanide or cuprous iodide or bromide in NN-dimethylformamide gives alkenynes in good yield. The mechanisms of these reactions are discussed. Under the conditions studied cuprous cyanide and 1-cyanoallenes do not react.
P. M. Greaves, S. R. Landor and D. R. J. Laws, J. Chem. Soc. C, 1966, 1976 DOI: 10.1039/J39660001976
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