Answers are grounded in this paper and cite their sources.
The reactions of acetylenes with bromine in alcohols at 20–25 °C afford dibromodialkoxyalkanes in good yields together with variable amounts of dibromoalkenes. Similar treatment of phenylacetylene with copper(II) bromide gives only bromophenylacetylene and 2-phenyl-1,1,2-tribromoethylene, the latter being formed by dibromination of the former with copper(II) bromide.
No takes yet. Share an insight, caveat, or question.
Uemura et al. (1978) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: