Fig. 6: Mechanistic experiments.
From: Ni-catalyzed hydroarylation of alkynes with unactivated β-C(sp2)−H bonds

a Deuterium-labeling experiment, showing that C4−D was completely transferred to the alkene of the product. b Kinetic isotopic effect determination: a significant KIE for C4−H bond suggests that the activation of C4−H bond could be a rate-determining step. c Proposed mechanism.