To a flame-dried 20-mL microwave vial equipped with a magnetic stir bar was added crude bromide (710 mg, 1.88 mmol, 1.0 equiv), and benzenesulfinic acid sodium salt (619 mg, 3.77 mmol, 2.0 equiv). The microwave vial was sealed with a Teflon microwave cap, and DMF (3.7 mL, 0.5 M) was added to the reaction mixture. The reaction vessel was transferred to a 45 °C pre-heated oil bath.