Fig. 2: Co-catalyzed propargylation of aldehyde in the absence of a ligand.

The reaction was performed by using CoCl2 (10 mol %), 1a (1.5 equiv), 2a (1.0 equiv) and Mn (2.0 equiv) in MeCN at 22 °C for 12 h.
The reaction was performed by using CoCl2 (10 mol %), 1a (1.5 equiv), 2a (1.0 equiv) and Mn (2.0 equiv) in MeCN at 22 °C for 12 h.