Fig. 3
From: Highly selective nickel-catalyzed gem-difluoropropargylation of unactivated alkylzinc reagents

Mechanistic studies. a A1 catalyzed reaction of 1a with 2a. b D1 catalyzed reaction of 1a with 2a. c B1 catalyzed reaction of 1a with 2a. d C1 catalyzed reaction of 1a with 2a. e Stoichiometric reaction of B1 with 2a. f Stoichiometric reaction of C1 with 2a. g Stoichiometric reaction of B1 with 1a. h Proposed reaction mechanism