A New Alkenynylamine Synthesis

α-Ferrocenylvinylacetylenes

“…Further, we have found that Bu t OK in THF, unlike Bu t OK in DMSO, 4,10,11 is a convenient reagent 1 for the preparation of ferrocenylvinylacetylenes from corresponding gem-dibromocyclopropanes 9a-c, § § the yields of acetylenes 3a-c can be as high as 52-63%. † † However, the formation of methyl vinyl ketones 6a-c (8-15%) during isolation and purification cannot be avoided:…”