Fig. 1: Transition-metal catalyzed C-N bond formation of haloarenes.
From: Nickel catalyzed C-N coupling of haloarenes with B2N4 reagents

a transition metal catalyzed amination with haloarenes. b Ni(I)/Ni(III) redox cycles promoted by single electron reductant. c transition metal catalyzed borylation utilizing B2O4 type regents. d Ni(I)/Ni(III) cycle promoted C-N coupling of B2N4. LGÂ leaving group, FG functional group.