An evacuated flame-dried 100-mL round-bottomed flask equipped with a magnetic stir bar and a Schlenk adapter was brought into a glovebox. Once in the glovebox, the flask was filled with a nitrogen atmosphere. Solid KHMDS (2.79 g, 14.0 mmol, 1.1 equiv) was added and the flask was sealed. The flask was removed from the glovebox, and the flask was evacuated and backfilled with nitrogen three times using a dual manifold Schlenk line. The Schlenk adapter was replaced with a rubber septum and the flask was placed under a nitrogen atmosphere.