Iridium-catalyzed borylation of pyrene: Irreversibility and the influence of ligand on selectivity

Abstract

The iridium-catalyzed borylation of pyrene, using 4,4′-dimethyl-2,2′-bipyridine as the ligand, in the presence of t-BuOK, gave a mixture of 2,4,7,9-tetrakis(Bpin)-pyrene (c4) and its 2,4,7,10-isomer (m4) in a 2.2:1 ratio, and the selectivity of the Ir-catalyzed borylation of pyrene is kinetically determined and can be influenced to some extent by the nature of the ligand.