New method for the preparation of activated nickel and cobalt powders and their application in biaryl synthesis

Ligand‐Free Iron‐Catalyzed Homo‐Coupling of Aryllithium Reagents

“…Although good yields were observed, neither of these catalysts could give better results. Attempt to lower the loading of catalyst and the amount of the oxidant were also carried out, respectively ( Table 1, entries [15][16], proving that 5 mol% of FeCl 3 or 1.0 equivalent oxidant would harshly decrease the yield of 2 a. Thus, we also employed lower catalytic loading and oxidant together (Table 1, entry 17), and as expected, 90% yield was achieved.…”

Concise Synthesis and Crystal Structure of [12]Cycloparaphenylene

“…Notably, however, no nickel-mediated homocoupling reaction has been utilized in the synthesis of relatively large macrocycles, and this is presumably because of the mechanistic complexity [13] in aryl-aryl bond formation. [14] Nevertheless, we were encouraged by the X-ray crystal structure of 1 a (Scheme 3 B), [15] which revealed its nearly ideal "included" angle (ca. 808, see the Supporting Information).…”

Synthesis of nickel-salicylideneimines complexes and catalyzing cross-coupling reaction of aryl halides and Grignard reagents

“…reported in ref. [13]). 1 H NMR (CDCl 3 , 300 MHz) d 2.36 (s, 12H), 7.11-7.13 (m, 2H), 7.14-7.18 (m, 4H).…”