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The terminal enynes 10–12 were prepared from the corresponding aldehydes 6–8 by applying conventional methods of acetylene chemistry. After exploratory study of the reactivity of these hydrocarbons (preparation of 13, 18, and 19 from 10) these building blocks were subsequently oxidatively dimerized (Glaser coupling) to the sterically protected oligoenynes 22–25; McMurry coupling of 13 yielded 26 as...
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