The reduction of acetophenone was achieved using a CBS catalyst and borane reagent. Students assembled oven-dried glassware under nitrogen before using the PureSolv Micro to deliver anhydrous THF to the flasks. Teaching assistants then delivered (R)-CBS reagent to half of the groups and (S)-CBS reagent to the other half. At the same time, another teaching assistant provided the borane reagent, borane dimethyl sulfide (BMS). Although Borane-THF is ideal due to the odorous dimethyl sulfide in borane-dimethyl sulfide, for some reason, borane-THF did not work in our trial runs. The reaction mixture was cooled in an ice bath. Students added the acetophenone to anhydrous THF in a separate dry 3-dram vial before administering the solution dropwise to the reaction flask. The reaction was stirred for 30 minutes (Scheme 2) in the ice bath and under nitrogen. The nitrogen flow was controlled using an oil bubbler.