The reaction of 9-borabicyclo[3.3.1]nonane with alkynyltrimethylstannanes (Me3Sn–C![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
C–R) yields a new alkene (R = But) and new allenes (R = Me3Si or Me3Sn); the formation of both types of compound is not consistent with hydroboration but involves exchange reactions, alkynyl borate intermediates, and organoboration.
B. Wrackmeyer and C. Bihlmayer, J. Chem. Soc., Chem. Commun., 1981, 1093 DOI: 10.1039/C39810001093
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