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Synthesis of Cyanoalkynes from Alkyne Bromide and CuCN
A direct generation of cyanoalkynes from alkyne bromide and CuCN was reported. Mild reaction conditions were required, using catalytical amount of KI as the additive and DMSO as the solvent under 60 degrees C. GC analysis showed that alkyne iodide may be the intermediate. Both aromatic ethynyl bromides and aliphatic ethynyl bromides were proved to be good substrates. Good isolated yield was also observed in 10 gram scale synthesis. This method has provided an important alternative synthetic route to cyanoalkyne structures.
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