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The complexation behavior of unsaturated fatty hydrocarbons, i.e., 1,7-octadiyne and 1,7-octadiene, by a perethylated pillar[5]arene has been investigated, which was compared with that for saturated n-octane. It was found that the host–guest binding strength increased in accordance with the electron-negativity of the terminal carbon atom on the guests: alkyne>alkene>alkane.
A simple and efficient protocol for CuI‐catalyzed oxidative homocoupling reaction of terminal alkynes to symmetrical 1,4‐disubstituted 1,3‐diynes was reported. The reaction can be carried out in the open air, using NaOAc as a base in the absence of any other additives. A variety of terminal alkynes were converted to the corresponding 1.3‐diynes in good to excellent yields without any side product...
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