Low-temperature reaction of lithium dialkyldialkynylborates Li+[R12B(C![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CR2)2]–(R1= 1,2-dimethylpropyl or cyclohexyl) with iodine in tetrahydrofuran gives symmetrical conjugated diynes in excellent yield.
A. Pelter, K. Smith and M. Tabata, J. Chem. Soc., Chem. Commun., 1975, 857 DOI: 10.1039/C39750000857
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