Pronounced effects of substituents on the iridium-catalyzed borylation of aryl C-H bonds.
Iridium trisboryl complexes containing bisphosphine and bipyridine ligands and pinacolate and catecholate substituents on boron are reported. A large difference in reactivity towards the borylation of C-H bonds is observed for this series of trisboryl complexes, and this difference is attributed to the electron-donating properties of the pinacolate vs. catecholate groups, and the steric and electronic properties of bipyridine vs. bisphosphine ligands.
Liskey
Carl W
CW
Department of Chemistry, University of Illinois, 600 South Mathews Av, Urbana, IL 61801, USA.
Wei
Carolyn S
CS
Pahls
Dale R
DR
Hartwig
John F
JF