3-Alkyl- and 3,3-dialkyl-1-bromoallenes are prepared in excellent yield by the action of hydrobromic acid (45–50%) on secondary or tertiary acetylenic carbinols. They show an exceptionally intense band in the infrared region, a small maximum in the ultraviolet region above 210 mµ, and the expected n.m.r. long range spin–spin coupling.
S. R. Landor, A. N. Patel, P. F. Whiter and P. M. Greaves, J. Chem. Soc. C, 1966, 1223 DOI: 10.1039/J39660001223
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