Nicholas Reactions of Alkynyl- and AlkenyltrifluoroboratesWe are grateful to NSERC (Canada) Discovery Grants programme (RGPIN-2016-04946) for support of this research.
Received: 13 June 2017
Accepted after revision: 04 July 2017
17 August 2017 (eFirst)
This paper is dedicated to Prof. Victor Snieckus, in consideration of his many years of mentorship and friendship, and for his tireless and continuing dedication to progress in synthetic aromatic chemistry
The Lewis acid mediated Nicholas reaction of potassium alkynyltrifluoroborates and propargyl acetate-hexacarbonyldicobalt complexes affords 1,4-diyne dicobalt hexacarbonyl complexes in good yields. The analogous Nicholas reactions of potassium alkenyltrifluoroborates give 1,3-enyne dicobalt hexacarbonyl complexes in most cases, although the initial site of reaction can vary. Potassium vinyltrifluoroborate itself affords alkynylcyclopropane complexes.