To a flame-dried 10-mL microwave vial with a magnetic stir bar was added enoxysilane 9-5 (28.0 mg, 0.05 mmol, 1.0 equiv) as a mixture of diastereomers and DME (250 µL, 0.2 M). To the stirred reaction mixture was added tetramethylammonium fluoride (6.9 mg, 0.075 mmol, 1.5 equiv), which resulted in a red reaction mixture. After stirring at room temperature for 30 minutes, the reaction was diluted with water (5 mL), and the layers were separated.