Condensation of propargylic alcohols with indoles and carbazole in [bmim][PF6]/Bi(NO3)3·5H2O: a simple high yielding propargylation method with recycling and reuse of the ionic liquid

G.G.K.S. Narayana Kumar, Gopalakrishnan Aridoss, Kenneth K. Laali
Tetrahedron Letters

Volume 53, Issue 24, 13 June 2012, Pages 3066–3069

http://dx.doi.org/10.1016/j.tetlet.2012.04.026