An evacuated flame-dried 5-mL microwave vial equipped with a magnetic stir bar was brought into a glove box and filled with nitrogen. Zeise's dimer (1.6 mg, 0.0043 mmol, 10 mol %) was added to the microwave vial. The microwave vial was removed from the glove box. The vial was evacuated and backfilled with nitrogen, and this process was repeated three times. To the reaction mixture was added a solution of cyclopropanol 9-7 (20.0 mg, 0.043 mmol, 1.0 equiv) in Et2O (0.43 mL, 0.1 M) at room temperature.