Nickel-Catalyzed Arylboration of Cyclopentene.

Abstract

A 500-mL, three-necked, round-bottom flask (24/40 ground glass joint, Flask A) is equipped with a 4.5 x 1.75-cm magnetic stir bar (Teflon-coated, egg-shaped), a rubber septum, a glass stopper, and a vacuum adapter with a stopcock (in the open position; connected to a dual manifold with bubbler). Flask A is evacuated (0.3 mmHg), flame-dried, and allowed to cool to room temperature under vacuum (Figure 1). The flask is then backfilled with a nitrogen atmosphere.